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Reviewer: Yingzhen Qu
Review result: Has Issues

I have been selected as the Routing Directorate reviewer for this draft. The
Routing Directorate seeks to review all routing or routing-related drafts as
they pass through IETF last call and IESG review, and sometimes on special
request. The purpose of the review is to provide assistance to the Routing ADs.
For more information about the Routing Directorate, please see
http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it would
be helpful if you could consider them along with any other IETF Last Call
comments that you receive, and strive to resolve them through discussion or by
updating the draft.

Document: draft-ietf-mpls-ldp-yang
Reviewer: Yingzhen Qu
Review Date: Nov 1st, 2019
Intended Status: Standards Track

Summary:

This document is near ready for publication. It has some issues that should be
at least considered prior to publication.

Comments:

Thanks for working on this draft. As an active YANG contributor I appreciate
the work here.

Major issues:

I’m not sure whether this should be considered as a major issue, which is how
the document is structured. The draft separates the configuration and operation
states into two sections, and this seems to be a before NMDA product and a bit
redundant to me. The tree structures are used in different ways multiple times
in the document, and this significantly reduces the readability of the modules.

Minor Issues:

I feel the English in this draft could be improved, but I’m not a native
speaker. Maybe RFC editor will help with this?

It seems that “model” and “module” are used exchangeable in this document,
please make them consistent.

“YANG” should be capital cased, and there are “yang” at multiple places in this
document. Please fix them.

Please consider add names to figures.

I understand inheritance is an important feature of document. I’d suggest maybe
add a section/paragraph in “overview” to introduce the concept and how it works
instead of repeating the idea with examples in every major container design.

Nits for your consideration:

Section 1.1
Whereas, the "extended" category contains all other non-base features.
Please consider remove “all” because not all other features are covered.

Section 3
extended "ietf-mpls-ldp-extended" module that models the extended
      LDP features and augments the base LDP
Please consider removed “extended” at the beginning, and add “module” at the
end, “augments the base LDP module”.

There are four main containers in our module(s):
I suppose you meant “four types of containers”?

Section 4
under LDP base and extended.
Please add a “module” at the end.

Section 5
Following is the high-level configuration organization for base LDP:
Please add a “module” at the end.

Typo in figure 3 “targeteted”

Typo in figure 4 “targeteted”

Given the configuration hierarchy, the model allows inheritance such
   that an item in a child tree is able to derive value from a similar
   or related item in one of the parent.
for grammar, it should be “one of the parents”, but this sentence is a bit
confusing. I’d suggest add a bit more explanation how inheritance work.

5.1.1
Missing period “.” at the end of the first sentence.

The tree showing here is not a complete tree, just want to make sure whether
this is intentional?

5.1.2
Missing period “.” at the end of the first sentence.

5.2.1.1
“LSR id” and “LSR Id” both are used here, please keep them consistent.

5.2.1.5
Missing “.” at the end of the first paragraph.

“A peer is uniquely identified using its
 LSR Id and hence LSR Id is the key for peer list”
Please consider simplify the sentence to “A peer is uniquely identified by its
LSR Id.”

Section 6
“  Operational state of LDP can be queried and obtained from read-only
   state containers that fall under the same tree (/rt:routing/
   rt:control-plane-protocols/) as the configuration.”
This sentence is a bit confusing. Please consider revise it.


From nobody Mon Nov  4 12:03:44 2019
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : YANG Data Model for MPLS LDP
        Authors         : Kamran Raza
                          Rajiv Asati
                          Xufeng Liu
                          Santosh Esale
                          Xia Chen
                          Himanshu Shah
	Filename        : draft-ietf-mpls-ldp-yang-07.txt
	Pages           : 97
	Date            : 2019-11-04

Abstract:
   This document describes a YANG data model for Multi-Protocol Label
   Switching (MPLS) Label Distribution Protocol (LDP).  The model also
   serves as the base model to define Multipoint LDP (mLDP) model.

   The YANG modules in this document conform to the Network Management
   Datastore Architecture (NMDA).


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-ldp-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-ldp-yang-07
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-ldp-yang-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ldp-yang-07


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Nov  4 12:14:32 2019
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--000000000000cd902d05968af5c8
Content-Type: text/plain; charset="UTF-8"

Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and sometimes
on special request. The purpose of the review is to provide assistance to
the Routing ADs. For more information about the Routing Directorate, please
see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-mpls-summary-frr-rsvpte.txt
Reviewer: Andy Malis
Review Date: 4 November 2019
IETF LC End Date: N/A (not yet last-called)
Intended Status: Standards Track

Summary:

This document is basically ready for publication, but has nits that should
be considered prior to publication.

Comments:

This is a well-written draft that is easy to follow. The draft has
benefitted from previous reviews, including during WG Last Call, when an
issue arose regarding the MTU size of the bypass tunnel resulting from FRR.
The draft is an extension to existing RSVP-TE signaling to reduce the
amount of signaling and increase the scalability for FRR. The draft is
careful to be backwards compatible with nodes that do not support it.

Major Issues:

No major issues found.

Minor Issues:

No minor issues found.

Nits:

Section 1, second paragraph: "large scale RSVP-TE LSPs deployment" ->
"large scale RSVP-TE deployment"

Section 2.1: The key words paragraph is out of date. The current wording is:

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.

RFC 8174 should also be added as a normative reference.

Section 3.1.2:

"The PLR MUST generate a new Message_Identifier each time the contents
 of the B-SFRR-Ready Extended ASSOCIATION ID changes; for example,
 when PLR node changes the bypass tunnel assignment." ->
"The PLR MUST generate a new Message_Identifier each time the contents
 of the B-SFRR-Ready Extended ASSOCIATION ID changes (e.g,,
 when the PLR node changes the bypass tunnel assignment)."

Section 4: The title of this section may be better as "Backwards
Compatibility" rather than just "Compatibility".

Section 5: "message, a slightly" -> "message, slightly"

Section 6: This section includes the URL for an IANA registry. These may
change over time as IANA reorganizes their registries, and thus just
referencing the appropriate registry and sub-registry by name is sufficient.

This section also contains a reference to the IANA "Resource Reservation
Protocol (RSVP) Parameters" registry, but that registry isn't referenced
elsewhere in the text and should be removed from this section.

Regards,
Andy

--000000000000cd902d05968af5c8
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<br><br>I have been selected as the Routing Director=
ate reviewer for this draft. The Routing Directorate seeks to review all ro=
uting or routing-related drafts as they pass through IETF last call and IES=
G review, and sometimes on special request. The purpose of the review is to=
 provide assistance to the Routing ADs. For more information about the Rout=
ing Directorate, please see <a href=3D"http://trac.tools.ietf.org/area/rtg/=
trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-mpls-summary-=
frr-rsvpte.txt <br>Reviewer: Andy Malis<br>Review Date: 4 November 2019 <br=
>IETF LC End Date: N/A (not yet last-called) <br>Intended Status: Standards=
 Track<br><br>Summary: <br><br>This document is basically ready for publica=
tion, but has nits that should be considered prior to publication.<br><br>C=
omments:<br><br>This is a well-written draft that is easy to follow. The dr=
aft has benefitted from previous reviews, including during WG Last Call, wh=
en an issue arose regarding the MTU size of the bypass tunnel resulting fro=
m FRR. The draft is an extension to existing RSVP-TE signaling to reduce th=
e amount of signaling and increase the scalability for FRR. The draft is ca=
reful to be backwards compatible with nodes that do not support it.<br><br>=
Major Issues:<br><br>No major issues found.<br><br>Minor Issues:<br><br>No =
minor issues found.<br><br>Nits:<br><br>Section 1, second paragraph: &quot;=
large scale RSVP-TE LSPs deployment&quot; -&gt; &quot;large scale RSVP-TE d=
eployment&quot;<br><br>Section 2.1: The key words paragraph is out of date.=
 The current wording is:<br><br>The key words &quot;MUST&quot;, &quot;MUST =
NOT&quot;, &quot;REQUIRED&quot;, &quot;SHALL&quot;, &quot;SHALL NOT&quot;,<=
br>&quot;SHOULD&quot;, &quot;SHOULD NOT&quot;, &quot;RECOMMENDED&quot;, &qu=
ot;NOT RECOMMENDED&quot;, &quot;MAY&quot;, and<br>&quot;OPTIONAL&quot; in t=
his document are to be interpreted as described in<br>BCP 14 [RFC2119] [RFC=
8174] when, and only when, they appear in all<br>capitals, as shown here.<b=
r><br>RFC 8174 should also be added as a normative reference.<br><br>Sectio=
n 3.1.2:<br><br>&quot;The PLR MUST generate a new Message_Identifier each t=
ime the contents<br>=C2=A0of the B-SFRR-Ready Extended ASSOCIATION ID chang=
es; for example,<br>=C2=A0when PLR node changes the bypass tunnel assignmen=
t.&quot; -&gt;<br>&quot;The PLR MUST generate a new Message_Identifier each=
 time the contents<br>=C2=A0of the B-SFRR-Ready Extended ASSOCIATION ID cha=
nges (e.g,,<br>=C2=A0when the PLR node changes the bypass tunnel assignment=
).&quot;<br><br>Section 4: The title of this section may be better as &quot=
;Backwards Compatibility&quot; rather than just &quot;Compatibility&quot;.<=
br><br>Section 5: &quot;message, a slightly&quot; -&gt; &quot;message, slig=
htly&quot;<br><br>Section 6: This section includes the URL for an IANA regi=
stry. These may change over time as IANA reorganizes their registries, and =
thus just referencing the appropriate registry and sub-registry by name is =
sufficient.<br><br>This section also contains a reference to the IANA &quot=
;Resource Reservation Protocol (RSVP) Parameters&quot; registry, but that r=
egistry isn&#39;t referenced elsewhere in the text and should be removed fr=
om this section.<br><br>Regards,<br>Andy<br><div><br></div></div>

--000000000000cd902d05968af5c8--


From nobody Mon Nov  4 12:18:21 2019
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From: IETF Secretariat <ietf-ipr@ietf.org>
To: <draft-ietf-mpls-rmr@ietf.org>
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Subject: [mpls] IPR Disclosure Juniper Networks, Inc.'s Statement about IPR related to draft-ietf-mpls-rmr
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Dear Kireeti Kompella, Luis M. Contreras:


An IPR disclosure that pertains to your Internet-Draft entitled "Resilient
MPLS Rings" (draft-ietf-mpls-rmr) was submitted to the IETF Secretariat on
2019-11-04 and has been posted on the "IETF Page of Intellectual Property
Rights Disclosures" (https://datatracker.ietf.org/ipr/3848/). The title of
the IPR disclosure is "Juniper Networks, Inc.'s Statement about IPR related
to draft-ietf-mpls-rmr"


Thank you

IETF Secretariat


From nobody Mon Nov  4 12:18:32 2019
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Subject: [mpls] IPR Disclosure Juniper Networks, Inc.'s Statement about IPR related to draft-ietf-mpls-rmr
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Dear Kireeti Kompella, Luis M. Contreras:


An IPR disclosure that pertains to your Internet-Draft entitled "Resilient
MPLS Rings" (draft-ietf-mpls-rmr) was submitted to the IETF Secretariat on
2019-11-04 and has been posted on the "IETF Page of Intellectual Property
Rights Disclosures" (https://datatracker.ietf.org/ipr/3849/). The title of
the IPR disclosure is "Juniper Networks, Inc.'s Statement about IPR related
to draft-ietf-mpls-rmr"


Thank you

IETF Secretariat


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Subject: [mpls] Tsvart last call review of draft-ietf-mpls-rmr-12
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Reviewer: Colin Perkins
Review result: Almost Ready

This document has been reviewed as part of the transport area review team's
ongoing effort to review key IETF documents. These comments were written
primarily for the transport area directors, but are copied to the document's
authors and WG to allow them to address any issues raised and also to the IETF
discussion list for information.

When done at the time of IETF Last Call, the authors should consider this
review as part of the last-call comments they receive. Please always CC
tsv-art@ietf.org if you reply to or forward this review.

The draft describes how MPLS can be used to configure ring topologies,
as is frequently used to provide resilience. This seems like a reasonable
thing to do - indeed I'm surprised such a specification doesn't already
exist. From a transport perspective, this looks reasonable, but I do have
some comments:

- The draft discusses resilience mechanisms, by which the ring can be
used to protect from link failures. There is, however, no discussion of
how to recover from loss of the various messages used to announce and
manage the ring network. It may be that the protocol used to convey
these messages provides appropriate reliability mechanisms and the
draft just needs to reference and clarify that. However, if not, it would
seem worth considering robustness to loss of the ring advertisement
and maintenance messages.

- Auto-discovery in Section 4 uses timers T1 and T2. It's not clear what
is the timeout value for these timers, and whether their value needs to
be statically chosen or somehow tuned based on the size of the network. 

- Similarly, Section 5 on Ring OAM specifies two timers. These have fixed
values of 3.3ms and 1s. It's not clear why these values were chosen or why
they are correct.

Nits:
- The Introduction talks about "transport networks". It's not clear what
is meant by this, and there might be an alternative term that's clearer.

- The last paragraph before Section 1.1 states: “The intent is not to
 construct rings in a mesh network,  and use those for protection”. I
can’t parse the grammar here – can you clarify?



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From: Mach Chen <mach.chen@huawei.com>
To: "mpls@ietf.org" <mpls@ietf.org>
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Hi all,

The IETF 106th meeting is approaching, we still have some time slots availa=
ble, if you have a draft and topic to present, please let us know.

Best regards,
Mach

> -----Original Message-----
> From: Mach Chen
> Sent: Monday, September 16, 2019 4:39 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@ietf.org
> Subject: MPLS WG - having a session at 106th in Singapore
>=20
> Dear MPLSers,
>=20
> FYI, we have requested a 2-hour session at 106th in Singapore,  if you ha=
ve
> any draft or topic to present,  please let us know.
>=20
> Best regards,
> Mach


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Hi,  Authors/editors

If you are NOT going to discuss/present the drafts at IETF 106, please send=
 a status report to us or the WG list by Friday Nov 15th, then it can be in=
cluded in the MPLS WG progress report.

Thanks,
Mach


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Reviewer: Nagendra Kumar
Review result: Has Issues

Hi,

I have reviewed this document as part of the Operational directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written with the intent of improving the operational aspects of
the IETF drafts per guidelines in RFC5706.

Comments that are not addressed in last call may be included
in AD reviews during the IESG review.  Document editors and WG chairs should
treat these comments just like any other last call comments.

Overall Summary:

This draft is a standard track proposing resiliency solution for RING
topology.Overall this is a well written document. Some ambiguities that need
attention are listed below.

More details below:

Section 3.6 proposes the below:

There are three proposals to avoid this:

   1.  Each ring node acting as ingress sends traffic with a TTL of at
       most 2*n, where n is the number of nodes in the ring.

--> I think the ring in most of the case will be transit where the LSP may
extend beyond the ring.  I think, setting the TTL to 2*n may affect the regular
traffic. For example if the ring is of size 3 connecting other ring nodes to
AGG/Core. When it receives a labeled packet with TTL of 250 and if it pushes
RING label with a TTL of 6, it will end up rewriting the inner TTL to a much
lesser value. Am I missing something?.

   2.  A ring node sends protected traffic (i.e., traffic switched from
       CW to AC or vice versa) with TTL just large enough to reach the
       egress.

--> Same as above.

   3.  A ring node sends protected traffic with a special purpose label
       below the ring LSP label.  A protecting node first checks for the
       presence of this label; if present, it means that the traffic is
       looping and MUST be dropped.

--> To me, this looks like a better option comparing to the above 2.

If it is the node with the lowest loopback address of all nodes with
   the highest mastership values, N declares itself master by
   readvertising its ring node TLV with the M bit set.

--> When the loopback address of Node N1 is lowest but the MV is not the
highest, what will be the behavior?. Since loopback address is unique, I think
N1 can still declare itself as the master. But I am trying to understand the
need for MV.

When there is exactly one ring master M (here, R2), M enters the Ring
   Identification Phase.  M indicates that it has successfully completed
   this phase by advertising ring link TLVs.

--> Section 4.1 defines Ring Node TLV and Ring Neighbor TLV. The above section
talks about Ring Link TLV. But I couldn't find any reference or details about
this TLV in the draft.

Section 4.4 says,

"M indicates that it has successfully completed
   this phase by advertising ring link TLVs.  This is the trigger for
   M's CW neighbor to enter the Ring Identification Phase.  "

It further says:

"If not, X computes a ring that includes all nodes that have
   completed the Ring Identification Phase (as seen by their ring link
   TLVs) and further contains the maximal number of nodes that belong to
   the ring. "

--> From the first statement, I am assuming that node M will advertise Ring
Link TLV after it selects CW and AC neighbors. so that the CW neighbor can
enter the Ring Identification phase. But the identification phase on M appears
to rely on neighbors that have completed Ring Identification phase. Wont M end
up waiting for Rink Link TLV from neighbors to start the election while the
neighbors are waiting for Ring Link TLV to enter Ring Identification phase?.
Did I misunderstood the election process?.

SS: Supported Signaling Protocols
        (100 = RSVP-TE; 010 = LDP; 001 = SPRING)

--> I think technically SPRING is not a label signaling protocol. Instead, it
should be IGP.

Few nits:

s/I-D.ietf-mpls-rfc4379bis/RFC8029

Thanks,
Nagendra


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From: Shraddha Hegde <shraddha@juniper.net>
To: Mach Chen <mach.chen@huawei.com>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singapore
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Subject: Re: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singapore
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Hi Mach,

I would like to present updates to below drafts.

1. draft-hegde-mpls-spring-epe-oam-03

Presenter: Shraddha/Kapil
Duration: 5 mins

2. draft-ninan-spring-mpls-inter-as-oam
Presenter:Shraddha/Kapil
Duration: 10 mins

Rgds
Shraddha

-----Original Message-----
From: mpls <mpls-bounces@ietf.org> On Behalf Of Mach Chen
Sent: Wednesday, November 6, 2019 8:36 AM
To: mpls@ietf.org
Cc: mpls-chairs@ietf.org
Subject: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singap=
ore

Hi all,

The IETF 106th meeting is approaching, we still have some time slots availa=
ble, if you have a draft and topic to present, please let us know.

Best regards,
Mach

> -----Original Message-----
> From: Mach Chen
> Sent: Monday, September 16, 2019 4:39 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@ietf.org
> Subject: MPLS WG - having a session at 106th in Singapore
>=20
> Dear MPLSers,
>=20
> FYI, we have requested a 2-hour session at 106th in Singapore,  if you=20
> have any draft or topic to present,  please let us know.
>=20
> Best regards,
> Mach

_______________________________________________
mpls mailing list
mpls@ietf.org
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$=20


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Date: Thu, 7 Nov 2019 22:16:58 +0530
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Subject: Re: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singapore
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--00000000000093cef90596c46a98
Content-Type: text/plain; charset="UTF-8"

Hi Mach,

I would like to know the following details:

1> Is it self sponsored?
2> When is the date and for how many days
3> How much time can I  get if I have a topic to deliver?

Thanks,
Abhijit

On Wed, Nov 6, 2019 at 8:36 AM Mach Chen <mach.chen@huawei.com> wrote:

> Hi all,
>
> The IETF 106th meeting is approaching, we still have some time slots
> available, if you have a draft and topic to present, please let us know.
>
> Best regards,
> Mach
>
> > -----Original Message-----
> > From: Mach Chen
> > Sent: Monday, September 16, 2019 4:39 PM
> > To: mpls@ietf.org
> > Cc: mpls-chairs@ietf.org
> > Subject: MPLS WG - having a session at 106th in Singapore
> >
> > Dear MPLSers,
> >
> > FYI, we have requested a 2-hour session at 106th in Singapore,  if you
> have
> > any draft or topic to present,  please let us know.
> >
> > Best regards,
> > Mach
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--00000000000093cef90596c46a98
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Mach,<div><br></div><div>I would like to know the follo=
wing details:</div><div><br></div><div>1&gt; Is it self sponsored?</div><di=
v>2&gt; When is the date and for how many days</div><div>3&gt; How much tim=
e can I=C2=A0 get if I have a topic to deliver?</div><div><br></div><div>Th=
anks,</div><div>Abhijit</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Wed, Nov 6, 2019 at 8:36 AM Mach Chen &lt;=
<a href=3D"mailto:mach.chen@huawei.com">mach.chen@huawei.com</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all,<br>
<br>
The IETF 106th meeting is approaching, we still have some time slots availa=
ble, if you have a draft and topic to present, please let us know.<br>
<br>
Best regards,<br>
Mach<br>
<br>
&gt; -----Original Message-----<br>
&gt; From: Mach Chen<br>
&gt; Sent: Monday, September 16, 2019 4:39 PM<br>
&gt; To: <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</=
a><br>
&gt; Cc: <a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-cha=
irs@ietf.org</a><br>
&gt; Subject: MPLS WG - having a session at 106th in Singapore<br>
&gt; <br>
&gt; Dear MPLSers,<br>
&gt; <br>
&gt; FYI, we have requested a 2-hour session at 106th in Singapore,=C2=A0 i=
f you have<br>
&gt; any draft or topic to present,=C2=A0 please let us know.<br>
&gt; <br>
&gt; Best regards,<br>
&gt; Mach<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

--00000000000093cef90596c46a98--


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From: Mach Chen <mach.chen@huawei.com>
To: Shraddha Hegde <shraddha@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singapore
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Date: Fri, 8 Nov 2019 03:51:14 +0000
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Subject: Re: [mpls] Reminder//RE: MPLS WG - having a session at 106th in Singapore
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Hi Shraddha,

Your requests received.

Best regards,
Mach

> -----Original Message-----
> From: Shraddha Hegde [mailto:shraddha@juniper.net]
> Sent: Friday, November 08, 2019 12:05 AM
> To: Mach Chen <mach.chen@huawei.com>; mpls@ietf.org
> Cc: mpls-chairs@ietf.org
> Subject: RE: [mpls] Reminder//RE: MPLS WG - having a session at 106th in
> Singapore
>=20
> Hi Mach,
>=20
> I would like to present updates to below drafts.
>=20
> 1. draft-hegde-mpls-spring-epe-oam-03
>=20
> Presenter: Shraddha/Kapil
> Duration: 5 mins
>=20
> 2. draft-ninan-spring-mpls-inter-as-oam
> Presenter:Shraddha/Kapil
> Duration: 10 mins
>=20
> Rgds
> Shraddha
>=20
> -----Original Message-----
> From: mpls <mpls-bounces@ietf.org> On Behalf Of Mach Chen
> Sent: Wednesday, November 6, 2019 8:36 AM
> To: mpls@ietf.org
> Cc: mpls-chairs@ietf.org
> Subject: [mpls] Reminder//RE: MPLS WG - having a session at 106th in
> Singapore
>=20
> Hi all,
>=20
> The IETF 106th meeting is approaching, we still have some time slots avai=
lable,
> if you have a draft and topic to present, please let us know.
>=20
> Best regards,
> Mach
>=20
> > -----Original Message-----
> > From: Mach Chen
> > Sent: Monday, September 16, 2019 4:39 PM
> > To: mpls@ietf.org
> > Cc: mpls-chairs@ietf.org
> > Subject: MPLS WG - having a session at 106th in Singapore
> >
> > Dear MPLSers,
> >
> > FYI, we have requested a 2-hour session at 106th in Singapore,  if you
> > have any draft or topic to present,  please let us know.
> >
> > Best regards,
> > Mach
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
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From: Mach Chen <mach.chen@huawei.com>
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From: Mach Chen <mach.chen@huawei.com>
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Hi,

You can find the preliminary agenda at: https://datatracker.ietf.org/meetin=
g/106/materials/agenda-106-mpls-00. The order and content may be changed.=20

Best regards,
Mach


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From: Tarek Saad <tsaad.net@gmail.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org" <draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org>, mpls <mpls@ietf.org>
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Subject: Re: [mpls] RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt
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Hi Andy,

Thanks much for you thorough review and comments. I=92ve updated the draft =
to address those (attached is the diff from latest version). I=92ll wait fo=
r the I-D submission tool to reopen and upload it. Inline for further respo=
nse.




From: "Andrew G. Malis" <agmalis@gmail.com<mailto:agmalis@gmail.com>>
Date: Monday, November 4, 2019 at 3:14 PM
To: "<rtg-ads@ietf.org<mailto:rtg-ads@ietf.org>>" <rtg-ads@ietf.org<mailto:=
rtg-ads@ietf.org>>
Cc: "rtg-dir@ietf.org<mailto:rtg-dir@ietf.org>" <rtg-dir@ietf.org<mailto:rt=
g-dir@ietf.org>>, "draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org<mailto:d=
raft-ietf-mpls-summary-frr-rsvpte.all@ietf.org>" <draft-ietf-mpls-summary-f=
rr-rsvpte.all@ietf.org<mailto:draft-ietf-mpls-summary-frr-rsvpte.all@ietf.o=
rg>>, mpls <mpls@ietf.org<mailto:mpls@ietf.org>>
Subject: RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt
Resent-From: <alias-bounces@ietf.org<mailto:alias-bounces@ietf.org>>
Resent-To: <mtaillon@cisco.com<mailto:mtaillon@cisco.com>>, Tarek Saad <tsa=
ad@juniper.net<mailto:tsaad@juniper.net>>, Rakesh Gandhi <rgandhi@cisco.com=
<mailto:rgandhi@cisco.com>>, <adeshmukh@juniper.net<mailto:adeshmukh@junipe=
r.net>>, <mjork@128technology.com<mailto:mjork@128technology.com>>, <vbeera=
m@juniper.net<mailto:vbeeram@juniper.net>>, <mach.chen@huawei.com<mailto:ma=
ch.chen@huawei.com>>, <tsaad.net@gmail.com<mailto:tsaad.net@gmail.com>>, <n=
.leymann@telekom.de<mailto:n.leymann@telekom.de>>, <loa@pi.nu<mailto:loa@pi=
.nu>>, <martin.vigoureux@nokia.com<mailto:martin.vigoureux@nokia.com>>, <db=
3546@att.com<mailto:db3546@att.com>>, <aretana.ietf@gmail.com<mailto:aretan=
a.ietf@gmail.com>>, Nicolai Leymann <n.leymann@telekom.de<mailto:n.leymann@=
telekom.de>>
Resent-Date: Monday, November 4, 2019 at 3:14 PM

Hello,

I have been selected as the Routing Directorate reviewer for this draft. Th=
e Routing Directorate seeks to review all routing or routing-related drafts=
 as they pass through IETF last call and IESG review, and sometimes on spec=
ial request. The purpose of the review is to provide assistance to the Rout=
ing ADs. For more information about the Routing Directorate, please see htt=
p://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir<https://urldefense.com/v3=
/__http:/trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir__;!8WoA6RjC81c!Xd-eP=
3UaAlzqvmEhzY7YofdmKwqzGOjHTZKNtY_tb41RRprKAQL_INl9G5AWmQ$>

Although these comments are primarily for the use of the Routing ADs, it wo=
uld be helpful if you could consider them along with any other IETF Last Ca=
ll comments that you receive, and strive to resolve them through discussion=
 or by updating the draft.

Document: draft-ietf-mpls-summary-frr-rsvpte.txt
Reviewer: Andy Malis
Review Date: 4 November 2019
IETF LC End Date: N/A (not yet last-called)
Intended Status: Standards Track

Summary:

This document is basically ready for publication, but has nits that should =
be considered prior to publication.

Comments:

This is a well-written draft that is easy to follow. The draft has benefitt=
ed from previous reviews, including during WG Last Call, when an issue aros=
e regarding the MTU size of the bypass tunnel resulting from FRR. The draft=
 is an extension to existing RSVP-TE signaling to reduce the amount of sign=
aling and increase the scalability for FRR. The draft is careful to be back=
wards compatible with nodes that do not support it.

Major Issues:

No major issues found.

Minor Issues:

No minor issues found.

Nits:

Section 1, second paragraph: "large scale RSVP-TE LSPs deployment" -> "larg=
e scale RSVP-TE deployment"
[TS]: addressed as proposed.

Section 2.1: The key words paragraph is out of date. The current wording is=
:

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.

RFC 8174 should also be added as a normative reference.
[TS]: thanks, this has been updated now.

Section 3.1.2:

"The PLR MUST generate a new Message_Identifier each time the contents
 of the B-SFRR-Ready Extended ASSOCIATION ID changes; for example,
 when PLR node changes the bypass tunnel assignment." ->
"The PLR MUST generate a new Message_Identifier each time the contents
 of the B-SFRR-Ready Extended ASSOCIATION ID changes (e.g,,
 when the PLR node changes the bypass tunnel assignment)."
[TS]: addressed as proposed.

Section 4: The title of this section may be better as "Backwards Compatibil=
ity" rather than just "Compatibility".
[TS]: addressed as proposed.


Section 5: "message, a slightly" -> "message, slightly"
[TS]: addressed as proposed.

Section 6: This section includes the URL for an IANA registry. These may ch=
ange over time as IANA reorganizes their registries, and thus just referenc=
ing the appropriate registry and sub-registry by name is sufficient.
[TS]: removed url and kept the reference by name.

This section also contains a reference to the IANA "Resource Reservation Pr=
otocol (RSVP) Parameters" registry, but that registry isn't referenced else=
where in the text and should be removed from this section.
[TS]: removed as not needed.

Regards,
Tarek


Regards,
Andy



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<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Hi Andy,<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Thanks much for you=
 thorough review and comments. I=92ve updated the draft to address those (a=
ttached is the diff from latest version). I=92ll wait for the I-D submissio=
n tool to reopen and upload it. Inline for
 further response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt"><o:p>&nbsp;</o:p></=
span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black"><br>
&nbsp;</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:&nbsp;</span></b><span style=3D"font-size:12.0p=
t;color:black">&quot;Andrew G. Malis&quot; &lt;<a href=3D"mailto:agmalis@gm=
ail.com" title=3D"mailto:agmalis@gmail.com"><span style=3D"color:purple">ag=
malis@gmail.com</span></a>&gt;<br>
<b>Date:&nbsp;</b>Monday, November 4, 2019 at 3:14 PM<br>
<b>To:&nbsp;</b>&quot;&lt;<a href=3D"mailto:rtg-ads@ietf.org"><span style=
=3D"color:purple">rtg-ads@ietf.org</span></a>&gt;&quot; &lt;<a href=3D"mail=
to:rtg-ads@ietf.org" title=3D"mailto:rtg-ads@ietf.org"><span style=3D"color=
:purple">rtg-ads@ietf.org</span></a>&gt;<br>
<b>Cc:&nbsp;</b>&quot;<a href=3D"mailto:rtg-dir@ietf.org"><span style=3D"co=
lor:purple">rtg-dir@ietf.org</span></a>&quot; &lt;<a href=3D"mailto:rtg-dir=
@ietf.org" title=3D"mailto:rtg-dir@ietf.org"><span style=3D"color:purple">r=
tg-dir@ietf.org</span></a>&gt;, &quot;<a href=3D"mailto:draft-ietf-mpls-sum=
mary-frr-rsvpte.all@ietf.org"><span style=3D"color:purple">draft-ietf-mpls-=
summary-frr-rsvpte.all@ietf.org</span></a>&quot;
 &lt;<a href=3D"mailto:draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org"><sp=
an style=3D"color:purple">draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org</=
span></a>&gt;, mpls &lt;<a href=3D"mailto:mpls@ietf.org"><span style=3D"col=
or:purple">mpls@ietf.org</span></a>&gt;<br>
<b>Subject:&nbsp;</b>RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt<=
br>
<b>Resent-From:&nbsp;</b>&lt;<a href=3D"mailto:alias-bounces@ietf.org"><spa=
n style=3D"color:purple">alias-bounces@ietf.org</span></a>&gt;<br>
<b>Resent-To:&nbsp;</b>&lt;<a href=3D"mailto:mtaillon@cisco.com"><span styl=
e=3D"color:purple">mtaillon@cisco.com</span></a>&gt;, Tarek Saad &lt;<a hre=
f=3D"mailto:tsaad@juniper.net"><span style=3D"color:purple">tsaad@juniper.n=
et</span></a>&gt;, Rakesh Gandhi &lt;<a href=3D"mailto:rgandhi@cisco.com"><=
span style=3D"color:purple">rgandhi@cisco.com</span></a>&gt;,
 &lt;<a href=3D"mailto:adeshmukh@juniper.net"><span style=3D"color:purple">=
adeshmukh@juniper.net</span></a>&gt;, &lt;<a href=3D"mailto:mjork@128techno=
logy.com"><span style=3D"color:purple">mjork@128technology.com</span></a>&g=
t;, &lt;<a href=3D"mailto:vbeeram@juniper.net"><span style=3D"color:purple"=
>vbeeram@juniper.net</span></a>&gt;,
 &lt;<a href=3D"mailto:mach.chen@huawei.com"><span style=3D"color:purple">m=
ach.chen@huawei.com</span></a>&gt;, &lt;<a href=3D"mailto:tsaad.net@gmail.c=
om"><span style=3D"color:purple">tsaad.net@gmail.com</span></a>&gt;, &lt;<a=
 href=3D"mailto:n.leymann@telekom.de"><span style=3D"color:purple">n.leyman=
n@telekom.de</span></a>&gt;,
 &lt;<a href=3D"mailto:loa@pi.nu"><span style=3D"color:purple">loa@pi.nu</s=
pan></a>&gt;, &lt;<a href=3D"mailto:martin.vigoureux@nokia.com"><span style=
=3D"color:purple">martin.vigoureux@nokia.com</span></a>&gt;, &lt;<a href=3D=
"mailto:db3546@att.com"><span style=3D"color:purple">db3546@att.com</span><=
/a>&gt;,
 &lt;<a href=3D"mailto:aretana.ietf@gmail.com"><span style=3D"color:purple"=
>aretana.ietf@gmail.com</span></a>&gt;, Nicolai Leymann &lt;<a href=3D"mail=
to:n.leymann@telekom.de"><span style=3D"color:purple">n.leymann@telekom.de<=
/span></a>&gt;<br>
<b>Resent-Date:&nbsp;</b>Monday, November 4, 2019 at 3:14 PM</span><span st=
yle=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"color:blac=
k">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black">Hello,<br>
<br>
I have been selected as the Routing Directorate reviewer for this draft. Th=
e Routing Directorate seeks to review all routing or routing-related drafts=
 as they pass through IETF last call and IESG review, and sometimes on spec=
ial request. The purpose of the
 review is to provide assistance to the Routing ADs. For more information a=
bout the Routing Directorate, please see&nbsp;<a href=3D"https://urldefense=
.com/v3/__http:/trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir__;!8WoA6RjC81=
c!Xd-eP3UaAlzqvmEhzY7YofdmKwqzGOjHTZKNtY_tb41RRprKAQL_INl9G5AWmQ$"><span st=
yle=3D"color:purple">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</=
span></a><br>
<br>
Although these comments are primarily for the use of the Routing ADs, it wo=
uld be helpful if you could consider them along with any other IETF Last Ca=
ll comments that you receive, and strive to resolve them through discussion=
 or by updating the draft.<br>
<br>
Document: draft-ietf-mpls-summary-frr-rsvpte.txt&nbsp;<br>
Reviewer: Andy Malis<br>
Review Date: 4 November 2019&nbsp;<br>
IETF LC End Date: N/A (not yet last-called)&nbsp;<br>
Intended Status: Standards Track<br>
<br>
Summary:&nbsp;<br>
<br>
This document is basically ready for publication, but has nits that should =
be considered prior to publication.<br>
<br>
Comments:<br>
<br>
This is a well-written draft that is easy to follow. The draft has benefitt=
ed from previous reviews, including during WG Last Call, when an issue aros=
e regarding the MTU size of the bypass tunnel resulting from FRR. The draft=
 is an extension to existing RSVP-TE
 signaling to reduce the amount of signaling and increase the scalability f=
or FRR. The draft is careful to be backwards compatible with nodes that do =
not support it.<br>
<br>
Major Issues:<br>
<br>
No major issues found.<br>
<br>
Minor Issues:<br>
<br>
No minor issues found.<br>
<br>
Nits:<br>
<br>
Section 1, second paragraph: &quot;large scale RSVP-TE LSPs deployment&quot=
; -&gt; &quot;large scale RSVP-TE deployment&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: a=
ddressed as proposed.</span><span style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black"><br>
Section 2.1: The key words paragraph is out of date. The current wording is=
:<br>
<br>
The key words &quot;MUST&quot;, &quot;MUST NOT&quot;, &quot;REQUIRED&quot;,=
 &quot;SHALL&quot;, &quot;SHALL NOT&quot;,<br>
&quot;SHOULD&quot;, &quot;SHOULD NOT&quot;, &quot;RECOMMENDED&quot;, &quot;=
NOT RECOMMENDED&quot;, &quot;MAY&quot;, and<br>
&quot;OPTIONAL&quot; in this document are to be interpreted as described in=
<br>
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all<br>
capitals, as shown here.<br>
<br>
RFC 8174 should also be added as a normative reference.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: t=
hanks, this has been updated now.</span><span style=3D"color:black"><o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black"><br>
Section 3.1.2:<br>
<br>
&quot;The PLR MUST generate a new Message_Identifier each time the contents=
<br>
&nbsp;of the B-SFRR-Ready Extended ASSOCIATION ID changes; for example,<br>
&nbsp;when PLR node changes the bypass tunnel assignment.&quot; -&gt;<br>
&quot;The PLR MUST generate a new Message_Identifier each time the contents=
<br>
&nbsp;of the B-SFRR-Ready Extended ASSOCIATION ID changes (e.g,,<br>
&nbsp;when the PLR node changes the bypass tunnel assignment).&quot;<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: a=
ddressed as proposed.</span><span style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black"><br>
Section 4: The title of this section may be better as &quot;Backwards Compa=
tibility&quot; rather than just &quot;Compatibility&quot;.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: a=
ddressed as proposed.</span><span style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">&nbsp;<=
/span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black"><br>
Section 5: &quot;message, a slightly&quot; -&gt; &quot;message, slightly&qu=
ot;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: a=
ddressed as proposed.</span><span style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar=
gin-bottom:12.0pt;margin-left:.5in">
<span style=3D"color:black"><br>
Section 6: This section includes the URL for an IANA registry. These may ch=
ange over time as IANA reorganizes their registries, and thus just referenc=
ing the appropriate registry and sub-registry by name is sufficient.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: r=
emoved url and kept the reference by name.</span><span style=3D"color:black=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"color:blac=
k"><br>
This section also contains a reference to the IANA &quot;Resource Reservati=
on Protocol (RSVP) Parameters&quot; registry, but that registry isn't refer=
enced elsewhere in the text and should be removed from this section.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">[TS]: r=
emoved as not needed.</span><span style=3D"color:black"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">&nbsp;<=
/span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Regards=
,</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Tarek</=
span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"color:blac=
k"><br>
<br>
Regards,<br>
Andy<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"color:blac=
k">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Tue, 12 Nov 2019 16:12:13 -0500
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To: Weiqiang Cheng <chengweiqiang@chinamobile.com>
Cc: Tarek Saad <tsaad.net@gmail.com>, draft-cheng-mpls-inband-pm-encapsulation@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Authors,
FYI:
The draft has some similarity with the functionality defined in the
following draft which is generically applicable to the all encap types:

https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00

You may want to have a look.

Thanks,
Rakesh




On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng <
chengweiqiang@chinamobile.com> wrote:

> Hi Tarek,
>
> Thank you very much for your comments.
>
> We authors had some discussion on it and our feedback is in-line.
>
>
>
> B.R.
>
> Weiqiang Cheng
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls [mailto:mpls-bounces@ietf.org] *=E4=
=BB=A3=E8=A1=A8 *Tarek Saad
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B47=E6=9C=8822=E6=97=
=A5 21:34
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-cheng-mpls-inband-pm-encapsulation@i=
etf.org
> *=E6=8A=84=E9=80=81:* mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* [mpls] Comments on draft draft-cheng-mpls-inband-pm=
-encapsulation
>
>
>
> Hi authors,
>
>
>
> From reading your draft, have the following comments:
>
>    - There=E2=80=99s a similar proposal in draft-ietf-mpls-rfc6374-sfl th=
at the
>    WG has worked on to achieve similar PM measurements. That proposal did=
 not
>    require a special label, nor requires carrying 2 new additional labels=
 in
>    label stack. Do you see any downside to the approach in
>    draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can=
 this
>    be highlighted.
>
> [Weiqiang]   Yes, the SFL proposal was carefully considered before this
> draft was written, and the major downsides of SFL include:
>
> 1. It seems that the current version of SFL targets at end-to-end
> performance measurement,  but our draft targets at both end-to-end and
> hop-by-hop performance measurement. Of course, someone may argue that the
> SFL can be extended to support hop-by-hop performance measurement, but if
> that happens, the SFL method is too complex for label management, because
> basically it assigns two implications to one mpls label.
>
> 2. The SFL method can't be applied when we want to achieve performance
> measurements on both LSP and PW synchronously, but the method described i=
n
> our draft can simply achieve that.
>
>
>
>    - It appears that the label below the =E2=80=9CFlow Indicator Label=E2=
=80=9D is used
>    to carry/embed context information: including a flow identifier and
>    additional flags - that are set by ingress. Normally, MPLS labels do n=
ot
>    embed any context information about the flow they carry within them. T=
he
>    context of the label is held by the node that allocates the label.
>
> [Weiqiang]   Your understanding is perfectly correct. And please also not=
e
> that in our draft the Flow-ID label values are allocated by an external N=
MS
> or a controller, that means the context of the Flow-ID label is held by a=
ll
> the nodes within the administrative domain. Furthermore, I want to stress
> that the method described in our draft has already been implemented by mo=
re
> than two vendors, and we plan to deploy it in our commercial 5G backhaul
> networks.
>
>
>
>
>
> Regards,
>
> Tarek
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr"><div>Hi Authors,</div><div>FYI:<br></div><div>The draft ha=
s some similarity with the functionality defined in the following draft whi=
ch is generically applicable to the all encap types:<br></div><div><br></di=
v><div><a href=3D"https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-dire=
ct-export-00">https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-e=
xport-00</a></div><div><br></div><div>You may want to have a look.<br></div=
><div><br></div><div>Thanks,</div><div>Rakesh</div><div><br></div><div><br>=
</div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng &lt;<a =
href=3D"mailto:chengweiqiang@chinamobile.com">chengweiqiang@chinamobile.com=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang=3D"ZH-CN"><div><p class=3D"MsoNormal"><span style=3D"font-size:10=
.5pt;color:rgb(31,73,125)" lang=3D"EN-US">Hi Tarek,<u></u><u></u></span></p=
><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125=
)" lang=3D"EN-US">Thank you very much for your comments.<u></u><u></u></spa=
n></p><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,7=
3,125)" lang=3D"EN-US">We authors had some discussion on it and our feedbac=
k is in-line.<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D=
"font-size:10.5pt;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb=
(31,73,125)" lang=3D"EN-US">B.R.<u></u><u></u></span></p><p class=3D"MsoNor=
mal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)" lang=3D"EN-US">W=
eiqiang Cheng<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D=
"font-size:10.5pt;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u>=
</span></p><div><div style=3D"border-color:rgb(181,196,223) currentcolor cu=
rrentcolor;border-style:solid none none;border-width:1pt medium medium;padd=
ing:3pt 0cm 0cm"><p class=3D"MsoNormal"><b><span style=3D"font-size:10pt;fo=
nt-family:SimSun">=E5=8F=91=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span><=
/span></b><span style=3D"font-size:10pt;font-family:SimSun" lang=3D"EN-US">=
 mpls [mailto:<a href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank">mp=
ls-bounces@ietf.org</a>] </span><b><span style=3D"font-size:10pt;font-famil=
y:SimSun">=E4=BB=A3=E8=A1=A8 </span></b><span style=3D"font-size:10pt;font-=
family:SimSun" lang=3D"EN-US">Tarek Saad<br></span><b><span style=3D"font-s=
ize:10pt;font-family:SimSun">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=
=3D"EN-US">:</span></span></b><span style=3D"font-size:10pt;font-family:Sim=
Sun" lang=3D"EN-US"> 2019</span><span style=3D"font-size:10pt;font-family:S=
imSun">=E5=B9=B4<span lang=3D"EN-US">7</span>=E6=9C=88<span lang=3D"EN-US">=
22</span>=E6=97=A5<span lang=3D"EN-US"> 21:34<br></span><b>=E6=94=B6=E4=BB=
=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"> <a href=
=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_bl=
ank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a><br></span><b>=E6=
=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"> <a hr=
ef=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br></span><=
b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"> =
[mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation<u></u><u>=
</u></span></span></p></div></div><p class=3D"MsoNormal"><span lang=3D"EN-U=
S"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-U=
S">Hi authors,<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D=
"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D=
"EN-US">From reading your draft, have the following comments:<u></u><u></u>=
</span></p><ul style=3D"margin-top:0cm" type=3D"disc"><li class=3D"MsoNorma=
l"><span lang=3D"EN-US">There=E2=80=99s a similar proposal in draft-ietf-mp=
ls-rfc6374-sfl that the WG has worked on to achieve similar PM measurements=
. That proposal did not require a special label, nor requires carrying 2 ne=
w additional labels in label stack. Do you see any downside to the approach=
 in draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can =
this be highlighted.<u></u><u></u></span></li></ul><p style=3D"margin-left:=
36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Yes, the SFL proposal was care=
fully considered before this draft was written, and the major downsides of =
SFL include:<u></u><u></u></span></p><p style=3D"margin-left:36pt"><span la=
ng=3D"EN-US">1. It seems that the current version of SFL targets at end-to-=
end performance measurement, =C2=A0but our draft targets at both end-to-end=
 and hop-by-hop performance measurement. Of course, someone may argue that =
the SFL can be extended to support hop-by-hop performance measurement, but =
if that happens, the SFL method is too complex for label management, becaus=
e basically=C2=A0it assigns two implications to one mpls label.<u></u><u></=
u></span></p><p style=3D"margin-left:36pt"><span lang=3D"EN-US">2. The SFL =
method can&#39;t be applied when we want to achieve performance measurement=
s on both LSP and PW=C2=A0synchronously, but the method described in our dr=
aft can simply=C2=A0achieve that.<u></u><u></u></span></p><p class=3D"MsoNo=
rmal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)" lang=3D"EN-US">=
<u></u>=C2=A0<u></u></span></p><ul style=3D"margin-top:0cm" type=3D"disc"><=
li class=3D"MsoNormal"><span lang=3D"EN-US">It appears that the label below=
 the =E2=80=9CFlow Indicator Label=E2=80=9D is used to carry/embed context =
information: including a flow identifier and additional flags - that are se=
t by ingress. Normally, MPLS labels do not embed any context information ab=
out the flow they carry within them. The context of the label is held by th=
e node that allocates the label.<u></u><u></u></span></li></ul><p style=3D"=
margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Your understanding=
 is=C2=A0perfectly correct. And please also note that in our draft the Flow=
-ID label values are allocated by an external NMS or a controller, that mea=
ns the context of the Flow-ID label is held by all the nodes within the adm=
inistrative domain. Furthermore, I want to stress that the method described=
 in our draft has already been implemented by more than two vendors, and we=
 plan to deploy it in our=C2=A0commercial 5G backhaul networks.<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:r=
gb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"Ms=
oNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"Ms=
oNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></p><p class=3D"=
MsoNormal"><span lang=3D"EN-US">Tarek<u></u><u></u></span></p></div></div>_=
______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 13 Nov 2019 07:56:20 -0500
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To: Tarek Saad <tsaad.net@gmail.com>
Cc: "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>,  "draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org" <draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org>, mpls <mpls@ietf.org>
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Subject: Re: [mpls] RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt
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Tarek,

You're very welcome!

One more small thing I noticed, seeing as you haven't uploaded yet .... :-)

The second paragraph in section 3 starts "This document proposes". It's no
longer a proposal, it should be "This document defines".

Cheers,
Andy


On Tue, Nov 12, 2019 at 10:31 AM Tarek Saad <tsaad.net@gmail.com> wrote:

> Hi Andy,
>
>
>
> Thanks much for you thorough review and comments. I=E2=80=99ve updated th=
e draft
> to address those (attached is the diff from latest version). I=E2=80=99ll=
 wait for
> the I-D submission tool to reopen and upload it. Inline for further
> response.
>
>
>
>
>
>
>
>
> *From: *"Andrew G. Malis" <agmalis@gmail.com>
> *Date: *Monday, November 4, 2019 at 3:14 PM
> *To: *"<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
> *Cc: *"rtg-dir@ietf.org" <rtg-dir@ietf.org>, "
> draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org" <
> draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org>, mpls <mpls@ietf.org>
> *Subject: *RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt
> *Resent-From: *<alias-bounces@ietf.org>
> *Resent-To: *<mtaillon@cisco.com>, Tarek Saad <tsaad@juniper.net>, Rakesh
> Gandhi <rgandhi@cisco.com>, <adeshmukh@juniper.net>, <
> mjork@128technology.com>, <vbeeram@juniper.net>, <mach.chen@huawei.com>, =
<
> tsaad.net@gmail.com>, <n.leymann@telekom.de>, <loa@pi.nu>, <
> martin.vigoureux@nokia.com>, <db3546@att.com>, <aretana.ietf@gmail.com>,
> Nicolai Leymann <n.leymann@telekom.de>
> *Resent-Date: *Monday, November 4, 2019 at 3:14 PM
>
>
>
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this draft.
> The Routing Directorate seeks to review all routing or routing-related
> drafts as they pass through IETF last call and IESG review, and sometimes
> on special request. The purpose of the review is to provide assistance to
> the Routing ADs. For more information about the Routing Directorate, plea=
se
> see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
> <https://urldefense.com/v3/__http:/trac.tools.ietf.org/area/rtg/trac/wiki=
/RtgDir__;!8WoA6RjC81c!Xd-eP3UaAlzqvmEhzY7YofdmKwqzGOjHTZKNtY_tb41RRprKAQL_=
INl9G5AWmQ$>
>
> Although these comments are primarily for the use of the Routing ADs, it
> would be helpful if you could consider them along with any other IETF Las=
t
> Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>
> Document: draft-ietf-mpls-summary-frr-rsvpte.txt
> Reviewer: Andy Malis
> Review Date: 4 November 2019
> IETF LC End Date: N/A (not yet last-called)
> Intended Status: Standards Track
>
> Summary:
>
> This document is basically ready for publication, but has nits that shoul=
d
> be considered prior to publication.
>
> Comments:
>
> This is a well-written draft that is easy to follow. The draft has
> benefitted from previous reviews, including during WG Last Call, when an
> issue arose regarding the MTU size of the bypass tunnel resulting from FR=
R.
> The draft is an extension to existing RSVP-TE signaling to reduce the
> amount of signaling and increase the scalability for FRR. The draft is
> careful to be backwards compatible with nodes that do not support it.
>
> Major Issues:
>
> No major issues found.
>
> Minor Issues:
>
> No minor issues found.
>
> Nits:
>
> Section 1, second paragraph: "large scale RSVP-TE LSPs deployment" ->
> "large scale RSVP-TE deployment"
>
> [TS]: addressed as proposed.
>
>
> Section 2.1: The key words paragraph is out of date. The current wording
> is:
>
> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
> "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
> "OPTIONAL" in this document are to be interpreted as described in
> BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
> capitals, as shown here.
>
> RFC 8174 should also be added as a normative reference.
>
> [TS]: thanks, this has been updated now.
>
>
> Section 3.1.2:
>
> "The PLR MUST generate a new Message_Identifier each time the contents
>  of the B-SFRR-Ready Extended ASSOCIATION ID changes; for example,
>  when PLR node changes the bypass tunnel assignment." ->
> "The PLR MUST generate a new Message_Identifier each time the contents
>  of the B-SFRR-Ready Extended ASSOCIATION ID changes (e.g,,
>  when the PLR node changes the bypass tunnel assignment)."
>
> [TS]: addressed as proposed.
>
>
> Section 4: The title of this section may be better as "Backwards
> Compatibility" rather than just "Compatibility".
>
> [TS]: addressed as proposed.
>
>
>
>
> Section 5: "message, a slightly" -> "message, slightly"
>
> [TS]: addressed as proposed.
>
>
> Section 6: This section includes the URL for an IANA registry. These may
> change over time as IANA reorganizes their registries, and thus just
> referencing the appropriate registry and sub-registry by name is sufficie=
nt.
>
> [TS]: removed url and kept the reference by name.
>
>
> This section also contains a reference to the IANA "Resource Reservation
> Protocol (RSVP) Parameters" registry, but that registry isn't referenced
> elsewhere in the text and should be removed from this section.
>
> [TS]: removed as not needed.
>
>
>
> Regards,
>
> Tarek
>
>
>
> Regards,
> Andy
>
>
>
>
>

--000000000000c975cb059739e4db
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Tarek,<div><br></div><div>You&#39;re very welcome!</div><d=
iv><br></div><div>One more small thing I noticed, seeing as you haven&#39;t=
 uploaded yet .... :-)</div><div><br></div><div>The second paragraph in sec=
tion 3 starts &quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">Th=
is document proposes&quot;. It&#39;s no longer a proposal, it should be &qu=
ot;</span><span style=3D"color:rgb(0,0,0);font-size:13.3333px">This documen=
t defines&quot;.</span></div><div><span style=3D"color:rgb(0,0,0);font-size=
:13.3333px"><br></span></div><div><span style=3D"color:rgb(0,0,0);font-size=
:13.3333px">Cheers,</span></div><div><span style=3D"color:rgb(0,0,0);font-s=
ize:13.3333px">Andy</span></div><div><span style=3D"color:rgb(0,0,0);font-s=
ize:13.3333px"><br></span></div></div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 12, 2019 at 10:31 AM Tarek Saad=
 &lt;<a href=3D"mailto:tsaad.net@gmail.com">tsaad.net@gmail.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-3843461829020446996WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12pt">Hi Andy,<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt">Thanks much for you t=
horough review and comments. I=E2=80=99ve updated the draft to address thos=
e (attached is the diff from latest version). I=E2=80=99ll wait for the I-D=
 submission tool to reopen and upload it. Inline for
 further response.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u><=
/span></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black"><br>
=C2=A0</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><b><span style=3D"font-s=
ize:12pt;color:black">From:=C2=A0</span></b><span style=3D"font-size:12pt;c=
olor:black">&quot;Andrew G. Malis&quot; &lt;<a href=3D"mailto:agmalis@gmail=
.com" title=3D"mailto:agmalis@gmail.com" target=3D"_blank"><span style=3D"c=
olor:purple">agmalis@gmail.com</span></a>&gt;<br>
<b>Date:=C2=A0</b>Monday, November 4, 2019 at 3:14 PM<br>
<b>To:=C2=A0</b>&quot;&lt;<a href=3D"mailto:rtg-ads@ietf.org" target=3D"_bl=
ank"><span style=3D"color:purple">rtg-ads@ietf.org</span></a>&gt;&quot; &lt=
;<a href=3D"mailto:rtg-ads@ietf.org" title=3D"mailto:rtg-ads@ietf.org" targ=
et=3D"_blank"><span style=3D"color:purple">rtg-ads@ietf.org</span></a>&gt;<=
br>
<b>Cc:=C2=A0</b>&quot;<a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank"=
><span style=3D"color:purple">rtg-dir@ietf.org</span></a>&quot; &lt;<a href=
=3D"mailto:rtg-dir@ietf.org" title=3D"mailto:rtg-dir@ietf.org" target=3D"_b=
lank"><span style=3D"color:purple">rtg-dir@ietf.org</span></a>&gt;, &quot;<=
a href=3D"mailto:draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org" target=3D=
"_blank"><span style=3D"color:purple">draft-ietf-mpls-summary-frr-rsvpte.al=
l@ietf.org</span></a>&quot;
 &lt;<a href=3D"mailto:draft-ietf-mpls-summary-frr-rsvpte.all@ietf.org" tar=
get=3D"_blank"><span style=3D"color:purple">draft-ietf-mpls-summary-frr-rsv=
pte.all@ietf.org</span></a>&gt;, mpls &lt;<a href=3D"mailto:mpls@ietf.org" =
target=3D"_blank"><span style=3D"color:purple">mpls@ietf.org</span></a>&gt;=
<br>
<b>Subject:=C2=A0</b>RtgDir review: draft-ietf-mpls-summary-frr-rsvpte.txt<=
br>
<b>Resent-From:=C2=A0</b>&lt;<a href=3D"mailto:alias-bounces@ietf.org" targ=
et=3D"_blank"><span style=3D"color:purple">alias-bounces@ietf.org</span></a=
>&gt;<br>
<b>Resent-To:=C2=A0</b>&lt;<a href=3D"mailto:mtaillon@cisco.com" target=3D"=
_blank"><span style=3D"color:purple">mtaillon@cisco.com</span></a>&gt;, Tar=
ek Saad &lt;<a href=3D"mailto:tsaad@juniper.net" target=3D"_blank"><span st=
yle=3D"color:purple">tsaad@juniper.net</span></a>&gt;, Rakesh Gandhi &lt;<a=
 href=3D"mailto:rgandhi@cisco.com" target=3D"_blank"><span style=3D"color:p=
urple">rgandhi@cisco.com</span></a>&gt;,
 &lt;<a href=3D"mailto:adeshmukh@juniper.net" target=3D"_blank"><span style=
=3D"color:purple">adeshmukh@juniper.net</span></a>&gt;, &lt;<a href=3D"mail=
to:mjork@128technology.com" target=3D"_blank"><span style=3D"color:purple">=
mjork@128technology.com</span></a>&gt;, &lt;<a href=3D"mailto:vbeeram@junip=
er.net" target=3D"_blank"><span style=3D"color:purple">vbeeram@juniper.net<=
/span></a>&gt;,
 &lt;<a href=3D"mailto:mach.chen@huawei.com" target=3D"_blank"><span style=
=3D"color:purple">mach.chen@huawei.com</span></a>&gt;, &lt;<a href=3D"mailt=
o:tsaad.net@gmail.com" target=3D"_blank"><span style=3D"color:purple">tsaad=
.net@gmail.com</span></a>&gt;, &lt;<a href=3D"mailto:n.leymann@telekom.de" =
target=3D"_blank"><span style=3D"color:purple">n.leymann@telekom.de</span><=
/a>&gt;,
 &lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank"><span style=3D"color:pu=
rple">loa@pi.nu</span></a>&gt;, &lt;<a href=3D"mailto:martin.vigoureux@noki=
a.com" target=3D"_blank"><span style=3D"color:purple">martin.vigoureux@noki=
a.com</span></a>&gt;, &lt;<a href=3D"mailto:db3546@att.com" target=3D"_blan=
k"><span style=3D"color:purple">db3546@att.com</span></a>&gt;,
 &lt;<a href=3D"mailto:aretana.ietf@gmail.com" target=3D"_blank"><span styl=
e=3D"color:purple">aretana.ietf@gmail.com</span></a>&gt;, Nicolai Leymann &=
lt;<a href=3D"mailto:n.leymann@telekom.de" target=3D"_blank"><span style=3D=
"color:purple">n.leymann@telekom.de</span></a>&gt;<br>
<b>Resent-Date:=C2=A0</b>Monday, November 4, 2019 at 3:14 PM</span><span st=
yle=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span style=3D"color:bla=
ck">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black">Hello,<br>
<br>
I have been selected as the Routing Directorate reviewer for this draft. Th=
e Routing Directorate seeks to review all routing or routing-related drafts=
 as they pass through IETF last call and IESG review, and sometimes on spec=
ial request. The purpose of the
 review is to provide assistance to the Routing ADs. For more information a=
bout the Routing Directorate, please see=C2=A0<a href=3D"https://urldefense=
.com/v3/__http:/trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir__;!8WoA6RjC81=
c!Xd-eP3UaAlzqvmEhzY7YofdmKwqzGOjHTZKNtY_tb41RRprKAQL_INl9G5AWmQ$" target=
=3D"_blank"><span style=3D"color:purple">http://trac.tools.ietf.org/area/rt=
g/trac/wiki/RtgDir</span></a><br>
<br>
Although these comments are primarily for the use of the Routing ADs, it wo=
uld be helpful if you could consider them along with any other IETF Last Ca=
ll comments that you receive, and strive to resolve them through discussion=
 or by updating the draft.<br>
<br>
Document: draft-ietf-mpls-summary-frr-rsvpte.txt=C2=A0<br>
Reviewer: Andy Malis<br>
Review Date: 4 November 2019=C2=A0<br>
IETF LC End Date: N/A (not yet last-called)=C2=A0<br>
Intended Status: Standards Track<br>
<br>
Summary:=C2=A0<br>
<br>
This document is basically ready for publication, but has nits that should =
be considered prior to publication.<br>
<br>
Comments:<br>
<br>
This is a well-written draft that is easy to follow. The draft has benefitt=
ed from previous reviews, including during WG Last Call, when an issue aros=
e regarding the MTU size of the bypass tunnel resulting from FRR. The draft=
 is an extension to existing RSVP-TE
 signaling to reduce the amount of signaling and increase the scalability f=
or FRR. The draft is careful to be backwards compatible with nodes that do =
not support it.<br>
<br>
Major Issues:<br>
<br>
No major issues found.<br>
<br>
Minor Issues:<br>
<br>
No minor issues found.<br>
<br>
Nits:<br>
<br>
Section 1, second paragraph: &quot;large scale RSVP-TE LSPs deployment&quot=
; -&gt; &quot;large scale RSVP-TE deployment&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: add=
ressed as proposed.</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black"><br>
Section 2.1: The key words paragraph is out of date. The current wording is=
:<br>
<br>
The key words &quot;MUST&quot;, &quot;MUST NOT&quot;, &quot;REQUIRED&quot;,=
 &quot;SHALL&quot;, &quot;SHALL NOT&quot;,<br>
&quot;SHOULD&quot;, &quot;SHOULD NOT&quot;, &quot;RECOMMENDED&quot;, &quot;=
NOT RECOMMENDED&quot;, &quot;MAY&quot;, and<br>
&quot;OPTIONAL&quot; in this document are to be interpreted as described in=
<br>
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all<br>
capitals, as shown here.<br>
<br>
RFC 8174 should also be added as a normative reference.<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: tha=
nks, this has been updated now.</span><span style=3D"color:black"><u></u><u=
></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black"><br>
Section 3.1.2:<br>
<br>
&quot;The PLR MUST generate a new Message_Identifier each time the contents=
<br>
=C2=A0of the B-SFRR-Ready Extended ASSOCIATION ID changes; for example,<br>
=C2=A0when PLR node changes the bypass tunnel assignment.&quot; -&gt;<br>
&quot;The PLR MUST generate a new Message_Identifier each time the contents=
<br>
=C2=A0of the B-SFRR-Ready Extended ASSOCIATION ID changes (e.g,,<br>
=C2=A0when the PLR node changes the bypass tunnel assignment).&quot;<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: add=
ressed as proposed.</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black"><br>
Section 4: The title of this section may be better as &quot;Backwards Compa=
tibility&quot; rather than just &quot;Compatibility&quot;.<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: add=
ressed as proposed.</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">=C2=A0</s=
pan><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black"><br>
Section 5: &quot;message, a slightly&quot; -&gt; &quot;message, slightly&qu=
ot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: add=
ressed as proposed.</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<span style=3D"color:black"><br>
Section 6: This section includes the URL for an IANA registry. These may ch=
ange over time as IANA reorganizes their registries, and thus just referenc=
ing the appropriate registry and sub-registry by name is sufficient.<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: rem=
oved url and kept the reference by name.</span><span style=3D"color:black">=
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span style=3D"color:bla=
ck"><br>
This section also contains a reference to the IANA &quot;Resource Reservati=
on Protocol (RSVP) Parameters&quot; registry, but that registry isn&#39;t r=
eferenced elsewhere in the text and should be removed from this section.<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">[TS]: rem=
oved as not needed.</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">=C2=A0</s=
pan><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">Regards,<=
/span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black">Tarek</sp=
an><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span style=3D"color:bla=
ck"><br>
<br>
Regards,<br>
Andy<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span style=3D"color:bla=
ck">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>

</blockquote></div>

--000000000000c975cb059739e4db--


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From: Mach Chen <mach.chen@huawei.com>
To: "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: IETF 106 MPLS session agenda updated
Thread-Index: AdWav8FoOl1M0AIASpGnFVVLowFk6Q==
Date: Thu, 14 Nov 2019 07:53:36 +0000
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Subject: [mpls] IETF 106 MPLS session agenda updated
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Hi,

Here is the latest agenda for the upcoming meeting: https://tools.ietf.org/=
wg/mpls/agenda.

Please start to send in your presentation slides. Since our meeting is on M=
onday, it would be great if you could send your slides by Sunday.

Best regards,
Mach



From nobody Sat Nov 16 18:19:45 2019
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From: Mach Chen <mach.chen@huawei.com>
To: "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: Reminder//RE: IETF 106 MPLS session agenda updated
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Date: Sun, 17 Nov 2019 02:19:35 +0000
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Subject: [mpls] Reminder//RE: IETF 106 MPLS session agenda updated
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Hi Speakers,

Please send your slides to us if you did not send yet, we need to upload th=
em to the website today.=20

Best regards,
Mach

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Mach Chen
Sent: Thursday, November 14, 2019 3:54 PM
To: mpls@ietf.org
Cc: mpls-chairs@ietf.org
Subject: [mpls] IETF 106 MPLS session agenda updated

Hi,

Here is the latest agenda for the upcoming meeting: https://tools.ietf.org/=
wg/mpls/agenda.

Please start to send in your presentation slides. Since our meeting is on M=
onday, it would be great if you could send your slides by Sunday.

Best regards,
Mach


_______________________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls


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From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] Reminder//RE: IETF 106 MPLS session agenda updated
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--------------677A5CE460ECA02EDA9FB0D5
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Mach,

My slides for the LSP Ping registry update.

/Loa

On 17/11/2019 10:19, Mach Chen wrote:
> Hi Speakers,
> 
> Please send your slides to us if you did not send yet, we need to upload them to the website today.
> 
> Best regards,
> Mach
> 
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Mach Chen
> Sent: Thursday, November 14, 2019 3:54 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@ietf.org
> Subject: [mpls] IETF 106 MPLS session agenda updated
> 
> Hi,
> 
> Here is the latest agenda for the upcoming meeting: https://tools.ietf.org/wg/mpls/agenda.
> 
> Please start to send in your presentation slides. Since our meeting is on Monday, it would be great if you could send your slides by Sunday.
> 
> Best regards,
> Mach
> 
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Rakesh Gandhi <rgandhi.ietf@gmail.com>, Weiqiang Cheng <chengweiqiang@chinamobile.com>
CC: Tarek Saad <tsaad.net@gmail.com>, "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Date: Sun, 17 Nov 2019 04:44:09 +0000
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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From: Tarek Saad <tsaad.net@gmail.com>
To: "draft-aa-mpls-ldp-link-shut@ietf.org" <draft-aa-mpls-ldp-link-shut@ietf.org>
CC: Vishnu Pavan Beeram <vbeeram@juniper.net>, mpls <mpls@ietf.org>
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+ mpls@ietf.org

From: Tarek Saad <tsaad.net@gmail.com>
Date: Sunday, November 17, 2019 at 2:32 PM
To: "draft-aa-mpls-ldp-link-shut@ietf.org" <draft-aa-mpls-ldp-link-shut@iet=
f.org>
Cc: Vishnu Pavan Beeram <vbeeram@juniper.net>
Subject: Comments on draft-aa-mpls-ldp-link-shut

Hi co-authors,

Having gone through this draft, I have the following comments:

1.      Draft does not mention LDP session protection feature -- aka target=
ed LDP session to peer that handles the case of keeping LDP session UP in c=
ase of Hello Adj or link adjacency down. I see several vendors (at least Ju=
niper/Cisco) who have support for this

2.      Section 2.5.5 or rfc5036 describes a hold timer that only after exp=
iring will trigger the Hello adjacency deletion =96 and only after the last=
 hello adjacency going down will trigger the LDP session to peer to go down=
.. i.e. the RFC 5036 does not dictate that LDP session to peer to go down i=
mmediately after link down as stated in draft-aa-mpls-ldp-link-shut section=
 3.


=93
   An LSR
   maintains a hold timer with each Hello adjacency that it restarts
   when it receives a Hello that matches the adjacency.  If the timer
   expires without receipt of a matching Hello from the peer, LDP
   concludes that the peer no longer wishes to label switch using that
   label space for that link (or target, in the case of Targeted Hellos)
   or that the peer has failed.  The LSR then deletes the Hello
   adjacency.  When the last Hello adjacency for an LDP session is
   deleted, the LSR terminates the LDP session by sending a Notification
   message and closing the transport connection.
=93
Given 2) above, do you still see ambiguity in handling link-down as describ=
ed in RFC5036?

Regards,
Tarek

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<div class=3D"WordSection1">
<p class=3D"MsoNormal">&#43; mpls@ietf.org<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"color:b=
lack">From: </span>
</b><span style=3D"color:black">Tarek Saad &lt;tsaad.net@gmail.com&gt;<br>
<b>Date: </b>Sunday, November 17, 2019 at 2:32 PM<br>
<b>To: </b>&quot;draft-aa-mpls-ldp-link-shut@ietf.org&quot; &lt;draft-aa-mp=
ls-ldp-link-shut@ietf.org&gt;<br>
<b>Cc: </b>Vishnu Pavan Beeram &lt;vbeeram@juniper.net&gt;<br>
<b>Subject: </b>Comments on draft-aa-mpls-ldp-link-shut<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Hi c=
o-authors,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Havi=
ng gone through this draft, I have the following comments:</span><o:p></o:p=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span lang=3D"EN-CA">Draft does not mention LDP ses=
sion protection feature -- aka targeted LDP session to peer that handles th=
e case of keeping LDP session UP in case of Hello Adj or link adjacency dow=
n. I see several vendors (at least
 Juniper/Cisco) who have support for this</span><o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span lang=3D"EN-CA">Section 2.5.5 or rfc5036 descr=
ibes a hold timer that only after expiring will trigger the Hello adjacency=
 deletion =96 and only after the last hello adjacency going down will trigg=
er the LDP session to peer to go down..
 i.e. the RFC 5036 does not dictate that LDP session to peer to go down imm=
ediately after link down as stated in draft-aa-mpls-ldp-link-shut section 3=
.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"EN-CA">=93</span><span style=
=3D"color:black">&nbsp; </span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;&nbsp;A=
n LSR</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;
<span style=3D"background:yellow">maintains a hold timer with each Hello ad=
jacency that it restarts</span></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; when i=
t receives a Hello that matches the adjacency.&nbsp; If the timer</span><o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; expire=
s without receipt of a matching Hello from the peer, LDP</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; conclu=
des that the peer no longer wishes to label switch using that</span><o:p></=
o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; label =
space for that link (or target, in the case of Targeted Hellos)</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; or tha=
t the peer has failed.&nbsp; The LSR then deletes the Hello</span><o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; adjace=
ncy.&nbsp; When the last Hello adjacency for an LDP session is</span><o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; delete=
d, the LSR terminates the LDP session by sending a Notification</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; messag=
e and closing the transport connection.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">=93<=
/span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Give=
n 2) above, do you still see ambiguity in handling link-down as described i=
n RFC5036?</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Rega=
rds,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Tare=
k</span><o:p></o:p></p>
</div>
</div>
</body>
</html>

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From: Tarek Saad <tsaad.net@gmail.com>
To: "draft-gandhi-mpls-rfc6374-sr@ietf.org" <draft-gandhi-mpls-rfc6374-sr@ietf.org>
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Subject: [mpls] Comments on draft-gandhi-mpls-rfc6374-sr
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Hi authors,

Having gone over this draft, I have the following comments:

  1.  Section 6.1.1 introduces a new block number TLV. The claim is RFC8231=
 requires identification of block number for proper LM. From looking at RFC=
8231, I see the AM method can be achieved with only 2 colors and many block=
s (see section 3.1 of RFC8231).. Given coloring for AM method can be done u=
sing SFL (draft-ietf-mpls-sfl-framework) with SFL labels, is this block num=
ber TLV still needed?
  2.  Section 4.3.2.1 introduces Return Path subtlv that is suposed to carr=
y the label stack or return path: 1) a similar return path tlv is proposed =
in other drafts e.g. for use with BFD over SR paths, LSP ping etc. =96 does=
 it make sense to have unified definition of this return path TLV? b) Figur=
e 7B mentions Segment-List (1) to Segment-List(n) , did you mean Label(1)/S=
egment(1) to Label(n)/Segment(n)?
  3.  Section 8) lightly talks about ECMP and loose SIDs in end-to-end PM m=
easurement =96 however, a) it is not clear how end-to-end LM is results are=
 reliable when ECMP is present? b) Similarly, for DM when ECMP for loose SI=
D(s) exists =96 how delay of each of the ECMP(s) are discovered or at least=
 what sender is doing to ensure all ECMP(s) are traversed by probes?

Regards,
Tarek

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi authors,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Having gone over this draft, I =
have the following comments:<o:p></o:p></span></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo1"><span lang=3D"EN-CA">Section 6.1.1 introduces a new block number TLV.=
 The claim is RFC8231 requires identification of block number for proper LM=
. From looking at RFC8231, I see the AM
 method can be achieved with only 2 colors and many blocks (see section 3.1=
 of RFC8231).. Given coloring for AM method can be done using SFL (draft-ie=
tf-mpls-sfl-framework) with SFL labels, is this block number TLV still need=
ed?<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"margin-le=
ft:0in;mso-list:l0 level1 lfo1"><span lang=3D"EN-CA">Section 4.3.2.1 introd=
uces Return Path subtlv that is suposed to carry the label stack or return =
path: 1) a similar return path tlv is proposed in other drafts e.g.
 for use with BFD over SR paths, LSP ping etc. =96 does it make sense to ha=
ve unified definition of this return path TLV? b) Figure 7B mentions Segmen=
t-List (1) to Segment-List(n) , did you mean Label(1)/Segment(1) to Label(n=
)/Segment(n)?<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D=
"margin-left:0in;mso-list:l0 level1 lfo1"><span lang=3D"EN-CA">Section 8) l=
ightly talks about ECMP and loose SIDs in
</span>end-to-end PM measurement =96 however, a) it is not clear how end-to=
-end LM is results are reliable when ECMP is present? b) Similarly, for DM =
when ECMP for loose SID(s) exists =96 how delay of each of the ECMP(s) are =
discovered or at least what sender is
 doing to ensure all ECMP(s) are traversed by probes?<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Tarek<o:p></o:p></span></p>
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From: Anush Mohan <anush.mohan@ericsson.com>
To: Tarek Saad <tsaad.net@gmail.com>, "draft-aa-mpls-ldp-link-shut@ietf.org" <draft-aa-mpls-ldp-link-shut@ietf.org>
CC: Vishnu Pavan Beeram <vbeeram@juniper.net>, mpls <mpls@ietf.org>
Thread-Topic: Comments on draft-aa-mpls-ldp-link-shut
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Date: Sun, 17 Nov 2019 07:17:38 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/0w33IR-z7DPSa-QDxvd3bWDT8gA>
Subject: Re: [mpls] Comments on draft-aa-mpls-ldp-link-shut
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Hi Tarek,

   Please find my replies inline.

Regards
Anush

From: Tarek Saad <tsaad.net@gmail.com>
Sent: Sunday, November 17, 2019 12:03 PM
To: draft-aa-mpls-ldp-link-shut@ietf.org
Cc: Vishnu Pavan Beeram <vbeeram@juniper.net>; mpls <mpls@ietf.org>
Subject: Re: Comments on draft-aa-mpls-ldp-link-shut

+ mpls@ietf.org<mailto:mpls@ietf.org>

From: Tarek Saad <tsaad.net@gmail.com<mailto:tsaad.net@gmail.com>>
Date: Sunday, November 17, 2019 at 2:32 PM
To: "draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp-link-shu=
t@ietf.org>" <draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp=
-link-shut@ietf.org>>
Cc: Vishnu Pavan Beeram <vbeeram@juniper.net<mailto:vbeeram@juniper.net>>
Subject: Comments on draft-aa-mpls-ldp-link-shut

Hi co-authors,

Having gone through this draft, I have the following comments:

1.      Draft does not mention LDP session protection feature -- aka target=
ed LDP session to peer that handles the case of keeping LDP session UP in c=
ase of Hello Adj or link adjacency down. I see several vendors (at least Ju=
niper/Cisco) who have support for this

                     [Anush]: Agree, we need to mention this. It helps for =
the issue mentioned in the draft.


2.      Section 2.5.5 or rfc5036 describes a hold timer that only after exp=
iring will trigger the Hello adjacency deletion - and only after the last h=
ello adjacency going down will trigger the LDP session to peer to go down..=
 i.e. the RFC 5036 does not dictate that LDP session to peer to go down imm=
ediately after link down as stated in draft-aa-mpls-ldp-link-shut section 3=
.


"
   An LSR
   maintains a hold timer with each Hello adjacency that it restarts
   when it receives a Hello that matches the adjacency.  If the timer
   expires without receipt of a matching Hello from the peer, LDP
   concludes that the peer no longer wishes to label switch using that
   label space for that link (or target, in the case of Targeted Hellos)
   or that the peer has failed.  The LSR then deletes the Hello
   adjacency.  When the last Hello adjacency for an LDP session is
   deleted, the LSR terminates the LDP session by sending a Notification
   message and closing the transport connection.
"
Given 2) above, do you still see ambiguity in handling link-down as describ=
ed in RFC5036?

              [Anush]: This particular section talks about procedures for m=
aintaining LDP hello adjacencies, but doesn't explicitly
                       prevent any implementation from immediately tearing =
down LDP session, when the only LDP enabled link to a
                       peer goes down. Other places in the RFC leave it ope=
n to the implementation, to decide  when to terminate an LDP
                       session.

Regards,
Tarek

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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Hi Tarek,<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">&nbsp;&nbsp; Please=
 find my replies inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Regards<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Anush<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt">From:</span></b>=
<span style=3D"font-size:11.0pt"> Tarek Saad &lt;tsaad.net@gmail.com&gt;
<br>
<b>Sent:</b> Sunday, November 17, 2019 12:03 PM<br>
<b>To:</b> draft-aa-mpls-ldp-link-shut@ietf.org<br>
<b>Cc:</b> Vishnu Pavan Beeram &lt;vbeeram@juniper.net&gt;; mpls &lt;mpls@i=
etf.org&gt;<br>
<b>Subject:</b> Re: Comments on draft-aa-mpls-ldp-link-shut<o:p></o:p></spa=
n></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&#43; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org=
</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"color:b=
lack">From: </span>
</b><span style=3D"color:black">Tarek Saad &lt;<a href=3D"mailto:tsaad.net@=
gmail.com">tsaad.net@gmail.com</a>&gt;<br>
<b>Date: </b>Sunday, November 17, 2019 at 2:32 PM<br>
<b>To: </b>&quot;<a href=3D"mailto:draft-aa-mpls-ldp-link-shut@ietf.org">dr=
aft-aa-mpls-ldp-link-shut@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-aa=
-mpls-ldp-link-shut@ietf.org">draft-aa-mpls-ldp-link-shut@ietf.org</a>&gt;<=
br>
<b>Cc: </b>Vishnu Pavan Beeram &lt;<a href=3D"mailto:vbeeram@juniper.net">v=
beeram@juniper.net</a>&gt;<br>
<b>Subject: </b>Comments on draft-aa-mpls-ldp-link-shut<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Hi c=
o-authors,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Havi=
ng gone through this draft, I have the following comments:</span><o:p></o:p=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span lang=3D"EN-CA">Draft does not mention LDP ses=
sion protection feature -- aka targeted LDP session to peer that handles th=
e case of keeping LDP session UP in case of Hello Adj or link adjacency dow=
n. I see several vendors (at least
 Juniper/Cisco) who have support for this</span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;color:#002060">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Anush]: Agree, we need to ment=
ion this. It helps for the issue mentioned in the draft.<o:p></o:p></span><=
/i></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span lang=3D"EN-CA">Section 2.5.5 or rfc5036 descr=
ibes a hold timer that only after expiring will trigger the Hello adjacency=
 deletion &#8211; and only after the last hello adjacency going down will t=
rigger the LDP session to peer to go down..
 i.e. the RFC 5036 does not dictate that LDP session to peer to go down imm=
ediately after link down as stated in draft-aa-mpls-ldp-link-shut section 3=
.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"EN-CA">&#8220;</span><span st=
yle=3D"color:black">&nbsp; </span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;&nbsp;A=
n LSR</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;
<span style=3D"background:yellow">maintains a hold timer with each Hello ad=
jacency that it restarts</span></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; when i=
t receives a Hello that matches the adjacency.&nbsp; If the timer</span><o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; expire=
s without receipt of a matching Hello from the peer, LDP</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; conclu=
des that the peer no longer wishes to label switch using that</span><o:p></=
o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; label =
space for that link (or target, in the case of Targeted Hellos)</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; or tha=
t the peer has failed.&nbsp; The LSR then deletes the Hello</span><o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; adjace=
ncy.&nbsp; When the last Hello adjacency for an LDP session is</span><o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; delete=
d, the LSR terminates the LDP session by sending a Notification</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; messag=
e and closing the transport connection.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&#82=
20;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Give=
n 2) above, do you still see ambiguity in handling link-down as described i=
n RFC5036?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;color:#7030A0">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; [Anush]: This particular section talks about procedures for maintaining L=
DP hello adjacencies, but doesn&#8217;t explicitly
<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;color:#7030A0">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;prevent any im=
plementation from immediately tearing down LDP session, when the only LDP e=
nabled link to a<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;color:#7030A0">&n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;peer goes down. Oth=
er places in the RFC leave it open to the implementation, to decide &nbsp;w=
hen to terminate an LDP
<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;color:#7030A0">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;session.<o:p><=
/o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Rega=
rds,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-CA">Tare=
k</span><o:p></o:p></p>
</div>
</div>
</body>
</html>

--_000_VI1PR0701MB2672F6415B820A035E126AEF83720VI1PR0701MB2672_--


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From: Anush Mohan <anush.mohan@ericsson.com>
To: Anush Mohan <anush.mohan@ericsson.com>, Tarek Saad <tsaad.net@gmail.com>,  "draft-aa-mpls-ldp-link-shut@ietf.org" <draft-aa-mpls-ldp-link-shut@ietf.org>
CC: Vishnu Pavan Beeram <vbeeram@juniper.net>, mpls <mpls@ietf.org>
Thread-Topic: Comments on draft-aa-mpls-ldp-link-shut
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Date: Sun, 17 Nov 2019 07:24:27 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/1umisEVTX_hg7llllWB8CiDwi10>
Subject: Re: [mpls] Comments on draft-aa-mpls-ldp-link-shut
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Hi Tarek,

   Please find my replies inline.

Regards
Anush

P.S:  Looks like my earlier reply got truncated.

From: Tarek Saad <tsaad.net@gmail.com>
Sent: Sunday, November 17, 2019 12:03 PM
To: draft-aa-mpls-ldp-link-shut@ietf.org
Cc: Vishnu Pavan Beeram <vbeeram@juniper.net>; mpls <mpls@ietf.org>
Subject: Re: Comments on draft-aa-mpls-ldp-link-shut

+ mpls@ietf.org<mailto:mpls@ietf.org>

From: Tarek Saad <tsaad.net@gmail.com<mailto:tsaad.net@gmail.com>>
Date: Sunday, November 17, 2019 at 2:32 PM
To: "draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp-link-shu=
t@ietf.org>" <draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp=
-link-shut@ietf.org>>
Cc: Vishnu Pavan Beeram <vbeeram@juniper.net<mailto:vbeeram@juniper.net>>
Subject: Comments on draft-aa-mpls-ldp-link-shut

Hi co-authors,

Having gone through this draft, I have the following comments:

1.      Draft does not mention LDP session protection feature -- aka target=
ed LDP session to peer that handles the case of keeping LDP session UP in c=
ase of Hello Adj or link adjacency down. I see several vendors (at least Ju=
niper/Cisco) who have support for this

                     [Anush]: Agree, we need to mention this. It helps for =
the issue mentioned in the draft.


2.      Section 2.5.5 or rfc5036 describes a hold timer that only after exp=
iring will trigger the Hello adjacency deletion - and only after the last h=
ello adjacency going down will trigger the LDP session to peer to go down..=
 i.e. the RFC 5036 does not dictate that LDP session to peer to go down imm=
ediately after link down as stated in draft-aa-mpls-ldp-link-shut section 3

                   [Anush]:   This particular section talks about procedure=
s for maintaining LDP hello adjacencies, but doesn't explicitly=20
                       prevent any implementation from immediately tearing =
down LDP session, when the only LDP enabled link to a
                       peer goes down. Other places in the RFC leave it ope=
n to the implementation, to decide  when to terminate an LDP=20
                       session.


From nobody Sun Nov 17 01:02:46 2019
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From: Tarek Saad <tsaad.net@gmail.com>
To: Weiqiang Cheng <chengweiqiang@chinamobile.com>, "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>, "draft-ietf-mpls-sfl-framework@ietf.org" <draft-ietf-mpls-sfl-framework@ietf.org>
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Thread-Topic: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Cheng,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks. I=A1=AFm explicitly adding the SFL ID author=
s to comment on some of your concerns too.<o:p></o:p></p>
<p class=3D"MsoNormal">See Inline for response..<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"color:b=
lack">From: </span>
</b><span style=3D"color:black">Weiqiang Cheng &lt;chengweiqiang@chinamobil=
e.com&gt;<br>
<b>Date: </b>Wednesday, September 25, 2019 at 3:00 PM<br>
<b>To: </b>'Tarek Saad' &lt;tsaad.net@gmail.com&gt;, &quot;draft-cheng-mpls=
-inband-pm-encapsulation@ietf.org&quot; &lt;draft-cheng-mpls-inband-pm-enca=
psulation@ietf.org&gt;<br>
<b>Cc: </b>&quot;mpls@ietf.org&quot; &lt;mpls@ietf.org&gt;<br>
<b>Subject: </b>Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-enc=
apsulation<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">Hi Tarek,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">Thank you very much for your comments.</span><o:p></o=
:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">We authors had some discussion on it and our feedback=
 is in-line.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">B.R.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">Weiqiang Cheng</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.5pt;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:10.0pt;font-family:SimSun">=B7=A2=BC=FE=C8=CB:</span></b><span style=3D"=
font-size:10.0pt;font-family:SimSun"> mpls [mailto:mpls-bounces@ietf.org]
<b>=B4=FA=B1=ED </b>Tarek Saad<br>
<b>=B7=A2=CB=CD=CA=B1=BC=E4:</b> 2019=C4=EA7=D4=C222=C8=D5 21:34<br>
<b>=CA=D5=BC=FE=C8=CB:</b> draft-cheng-mpls-inband-pm-encapsulation@ietf.or=
g<br>
<b>=B3=AD=CB=CD:</b> mpls@ietf.org<br>
<b>=D6=F7=CC=E2:</b> [mpls] Comments on draft draft-cheng-mpls-inband-pm-en=
capsulation</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi authors,<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">From reading your draft, =
have the following comments:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;text-indent:-.25in;mso-li=
st:l0 level1 lfo1">
<![if !supportLists]><span style=3D"font-size:10.0pt;font-family:Symbol"><s=
pan style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>There=A1=AFs a similar proposal in draft-iet=
f-mpls-rfc6374-sfl that the WG has worked on to achieve similar PM measurem=
ents. That proposal did not require a special label, nor requires carrying =
2 new additional labels in label stack.
 Do you see any downside to the approach in draft-ietf-mpls-rfc6374-sfl vs.=
 the new one introduced one? If so, can this be highlighted.<o:p></o:p></p>
<p style=3D"margin-left:1.0in">[Weiqiang] &nbsp; Yes, the SFL proposal was =
carefully considered before this draft was written, and the major downsides=
 of SFL include:<o:p></o:p></p>
<ul type=3D"disc">
<ol start=3D"1" type=3D"1">
<li style=3D"mso-list:l0 level2 lfo1">It seems that the current version of =
SFL targets at end-to-end performance measurement, &nbsp;but our draft targ=
ets at both end-to-end and hop-by-hop performance measurement. Of course, s=
omeone may argue that the SFL can be extended
 to support hop-by-hop performance measurement, but if that happens, the SF=
L method is too complex for label management, because basically&nbsp;it ass=
igns two implications to one mpls label.<o:p></o:p></li></ol>
</ul>
<p class=3D"MsoNormal">[TS]: Yes, don=A1=AFt see reason for SFL not working=
 for hop-by-hop measurements too.. =A1=B0too complex=A1=B1 is probably subj=
ective here.. What I see is SFL is not introducing new HW requirements/supp=
ort and hence arguably less complex than the alternative
 proposed here which requires new HW support. Also note, rfc8321 Alternate =
states that 2 SFL labels can be used for coloring flows.<o:p></o:p></p>
<p style=3D"margin-left:1.0in">2. The SFL method can't be applied when we w=
ant to achieve performance measurements on both LSP and PW&nbsp;synchronous=
ly, but the method described in our draft can simply&nbsp;achieve that.<o:p=
></o:p></p>
<p class=3D"MsoNormal">[TS]: differing answer to this to authors for SFL do=
cument.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1F497D">&nbsp=
;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;text-indent:-.25in;mso-li=
st:l1 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:10.0pt;font-family:Symbol"><s=
pan style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>It appears that the label below the =A1=B0Fl=
ow Indicator Label=A1=B1 is used to carry/embed context information: includ=
ing a flow identifier and additional flags - that are set by ingress. Norma=
lly, MPLS labels do not embed any context
 information about the flow they carry within them. The context of the labe=
l is held by the node that allocates the label.<o:p></o:p></p>
<p style=3D"margin-left:1.0in">[Weiqiang] &nbsp; Your understanding is&nbsp=
;perfectly correct. And please also note that in our draft the Flow-ID labe=
l values are allocated by an external NMS or a controller, that means the c=
ontext of the Flow-ID label is held by all the
 nodes within the administrative domain. Furthermore, I want to stress that=
 the method described in our draft has already been implemented by more tha=
n two vendors, and we plan to deploy it in our&nbsp;commercial 5G backhaul =
networks.<o:p></o:p></p>
<p class=3D"MsoNormal">[TS]: I am concerned that you are redefining the for=
mat of the MPLS label =A8C In Figure 1 in draft-cheng-mpls-inband-pm-encaps=
ulation, I see the last label in the MPLS label stack is overloading MPLS l=
abel fields (TC, and TTL) to carry flags
 and other reserved field.. This is in violation to RFC3032 (to the least) =
and may have other implications too.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Tarek<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Tarek<o:p></o:p></p>
</div>
</div>
</body>
</html>

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From: "Rakesh Gandhi (rgandhi)" <rgandhi@cisco.com>
To: Tarek Saad <tsaad.net@gmail.com>, "draft-gandhi-mpls-rfc6374-sr@ietf.org" <draft-gandhi-mpls-rfc6374-sr@ietf.org>
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From: Tarek Saad <tsaad.net@gmail.com>
To: "draft-gandhi-spring-ioam-sr-mpls@ietf.org" <draft-gandhi-spring-ioam-sr-mpls@ietf.org>
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Hi authors,

Having read through this draft, I have the following comments:


  1.  Is it possible that more than one IOAM encapsulating node tries to in=
sert IOAM header into same packet =96 e.g. consider hierarchical MPLS LSP(s=
).. If so, how to handle multiple encapsulating node(s) trying to add IOAM =
option/data after end of MPLS label stack? If not possible (or not supporte=
d), it=92d be good to explicitly state this
  2.  It is not clear what Figure 3 is serving in section 4?

Regards,
Tarek


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<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi authors,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Having read through this draft,=
 I have the following comments:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo1"><span lang=3D"EN-CA">Is it possible that more than one IOAM encapsula=
ting node tries to insert IOAM header into same packet =96 e.g. consider hi=
erarchical MPLS LSP(s).. If so, how to handle
 multiple encapsulating node(s) trying to add IOAM option/data after end of=
 MPLS label stack? If not possible (or not supported), it=92d be good to ex=
plicitly state this<o:p></o:p></span></li><li class=3D"MsoListParagraph" st=
yle=3D"margin-left:0in;mso-list:l0 level1 lfo1"><span lang=3D"EN-CA">It is =
not clear what Figure 3 is serving in section 4?<o:p></o:p></span></li></ol=
>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Tarek<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Mon, 18 Nov 2019 06:19:53 +0800
Message-ID: <CAMZsk6e=XiZBFPaqWwiWpunNEsfNCLgCdYt9RLS7aeBipKhuyw@mail.gmail.com>
To: Tianran Zhou <zhoutianran@huawei.com>
Cc: Weiqiang Cheng <chengweiqiang@chinamobile.com>, Tarek Saad <tsaad.net@gmail.com>,  "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>,  "mpls@ietf.org" <mpls@ietf.org>
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Tianran,
Thanks for your reply.
Right, IOAM Direct Export covers more than just PM. Both drafts would also
require special labels for the direct export for MPLS case. With this in
mind, you may clarify in the draft why lite way is required for PM for MPLS
case and how it is achieved with your draft compared to the IOAM direct
export.
Thanks,
Rakesh




On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou <zhoutianran@huawei.com>
wrote:

> Hi Rakesh,
>
>
>
> As the coauthor of both drafts, I think they are different.
>
> This draft is only for performance measurement in a lite way.
>
> IOAM-DEX is to collect data based on the trace type instruction.
>
>
>
> Thanks,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail.c=
om]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8813=E6=97=
=A5 5:12
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Weiqiang Cheng <chengweiqiang@chinamobile.=
com>
> *=E6=8A=84=E9=80=81:* Tarek Saad <tsaad.net@gmail.com>;
> draft-cheng-mpls-inband-pm-encapsulation@ietf.org; mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Authors,
>
> FYI:
>
> The draft has some similarity with the functionality defined in the
> following draft which is generically applicable to the all encap types:
>
>
>
> https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
>
>
>
> You may want to have a look.
>
>
>
> Thanks,
>
> Rakesh
>
>
>
>
>
>
>
>
>
> On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng <
> chengweiqiang@chinamobile.com> wrote:
>
> Hi Tarek,
>
> Thank you very much for your comments.
>
> We authors had some discussion on it and our feedback is in-line.
>
>
>
> B.R.
>
> Weiqiang Cheng
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls [mailto:mpls-bounces@ietf.org] *=E4=
=BB=A3=E8=A1=A8 *Tarek Saad
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B47=E6=9C=8822=E6=97=
=A5 21:34
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-cheng-mpls-inband-pm-encapsulation@i=
etf.org
> *=E6=8A=84=E9=80=81:* mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* [mpls] Comments on draft draft-cheng-mpls-inband-pm=
-encapsulation
>
>
>
> Hi authors,
>
>
>
> From reading your draft, have the following comments:
>
>    - There=E2=80=99s a similar proposal in draft-ietf-mpls-rfc6374-sfl th=
at the
>    WG has worked on to achieve similar PM measurements. That proposal did=
 not
>    require a special label, nor requires carrying 2 new additional labels=
 in
>    label stack. Do you see any downside to the approach in
>    draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can=
 this
>    be highlighted.
>
> [Weiqiang]   Yes, the SFL proposal was carefully considered before this
> draft was written, and the major downsides of SFL include:
>
> 1. It seems that the current version of SFL targets at end-to-end
> performance measurement,  but our draft targets at both end-to-end and
> hop-by-hop performance measurement. Of course, someone may argue that the
> SFL can be extended to support hop-by-hop performance measurement, but if
> that happens, the SFL method is too complex for label management, because
> basically it assigns two implications to one mpls label.
>
> 2. The SFL method can't be applied when we want to achieve performance
> measurements on both LSP and PW synchronously, but the method described i=
n
> our draft can simply achieve that.
>
>
>
>    - It appears that the label below the =E2=80=9CFlow Indicator Label=E2=
=80=9D is used
>    to carry/embed context information: including a flow identifier and
>    additional flags - that are set by ingress. Normally, MPLS labels do n=
ot
>    embed any context information about the flow they carry within them. T=
he
>    context of the label is held by the node that allocates the label.
>
> [Weiqiang]   Your understanding is perfectly correct. And please also not=
e
> that in our draft the Flow-ID label values are allocated by an external N=
MS
> or a controller, that means the context of the Flow-ID label is held by a=
ll
> the nodes within the administrative domain. Furthermore, I want to stress
> that the method described in our draft has already been implemented by mo=
re
> than two vendors, and we plan to deploy it in our commercial 5G backhaul
> networks.
>
>
>
>
>
> Regards,
>
> Tarek
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>

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<div dir=3D"ltr"><div>Hi Tianran,</div><div>Thanks for your reply.<br></div=
><div>Right, IOAM Direct Export covers more than just PM. Both drafts would=
 also require special labels for the direct export for MPLS case. With this=
 in mind, you may clarify in the draft why lite way is required for PM for =
MPLS case and how it is achieved with your draft compared to the IOAM direc=
t export.<br></div><div>Thanks,</div><div>Rakesh</div><div><br></div><div><=
br></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou &lt;<=
a href=3D"mailto:zhoutianran@huawei.com">zhoutianran@huawei.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"ZH-CN">
<div class=3D"gmail-m_-2429998435075507028WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Hi Rakesh,<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">As the coauthor=
 of both drafts, I think they are different.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">This draft is o=
nly for performance measurement in a lite way.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">IOAM-DEX is to =
collect data based on the trace type instruction.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Thanks,<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Tianran<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;\=
005fae\008f6f\0096c5\009ed1&quot;,sans-serif">=E5=8F=91=E4=BB=B6=E4=BA=BA<s=
pan lang=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-fa=
mily:&quot;\005fae\008f6f\0096c5\009ed1&quot;,sans-serif" lang=3D"EN-US"> R=
akesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"_b=
lank">rgandhi.ietf@gmail.com</a>]
<br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;\005fae\008f6f\00=
96c5\009ed1&quot;,sans-serif">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lan=
g=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-family:&q=
uot;\005fae\008f6f\0096c5\009ed1&quot;,sans-serif" lang=3D"EN-US"> 2019</sp=
an><span style=3D"font-size:11pt;font-family:&quot;\005fae\008f6f\0096c5\00=
9ed1&quot;,sans-serif">=E5=B9=B4<span lang=3D"EN-US">11</span>=E6=9C=88<spa=
n lang=3D"EN-US">13</span>=E6=97=A5<span lang=3D"EN-US">
 5:12<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamo=
bile.com" target=3D"_blank">chengweiqiang@chinamobile.com</a>&gt;<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Tarek Saad &lt;<a href=3D"mailto:tsaad.net@gmail.com" target=3D"_bl=
ank">tsaad.net@gmail.com</a>&gt;; <a href=3D"mailto:draft-cheng-mpls-inband=
-pm-encapsulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-en=
capsulation@ietf.org</a>; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a><br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulati=
on<u></u><u></u></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Authors,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">FYI:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft has some similarity w=
ith the functionality defined in the following draft which is generically a=
pplicable to the all encap types:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ioamteam-ippm-ioam-direct-export-00" target=3D"_blank">https:=
//tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00</a><u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You may want to have a look.<u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rakesh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Wed, Sep 25, 2019 at 3:00 AM=
 Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com" target=
=3D"_blank">chengweiqiang@chinamobile.com</a>&gt; wrote:<u></u><u></u></spa=
n></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Hi Tarek,</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Thank you very much for your comments.</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">We authors had some discussion on it and our feedback is i=
n-line.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">B.R.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Weiqiang Cheng</span><span lang=3D"EN-US"><u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:1=
0pt" lang=3D"EN-US"> mpls [mailto:</span><span lang=3D"EN-US"><a href=3D"ma=
ilto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D"font-size:10pt=
">mpls-bounces@ietf.org</span></a></span><span style=3D"font-size:10pt" lan=
g=3D"EN-US">]
</span><b><span style=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 </span></b><spa=
n style=3D"font-size:10pt" lang=3D"EN-US">Tarek Saad<br>
</span><b><span style=3D"font-size:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:10pt" l=
ang=3D"EN-US"> 2019</span><span style=3D"font-size:10pt">=E5=B9=B4<span lan=
g=3D"EN-US">7</span>=E6=9C=88<span lang=3D"EN-US">22</span>=E6=97=A5<span l=
ang=3D"EN-US"> 21:34<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> </span></span><span lang=3D"EN-US"><a href=3D"mailto:draft=
-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_blank"><span style=
=3D"font-size:10pt">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</span=
></a></span><span style=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E6=8A=84=E9=80=81<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US">
</span><span lang=3D"EN-US"><a href=3D"mailto:mpls@ietf.org" target=3D"_bla=
nk"><span style=3D"font-size:10pt">mpls@ietf.org</span></a></span><span sty=
le=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E4=B8=BB=E9=A2=98<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US"> [mpl=
s] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</span><span l=
ang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi authors,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">From reading your draft, have t=
he following comments:<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">There</span>=E2=80=99<span lang=3D"EN-US">s a similar =
proposal in draft-ietf-mpls-rfc6374-sfl that the WG has worked on to achiev=
e similar PM measurements. That proposal did not require a special label, n=
or requires carrying 2 new additional labels
 in label stack. Do you see any downside to the approach in draft-ietf-mpls=
-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted=
.<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Yes, t=
he SFL proposal was carefully considered before this draft was written, and=
 the major downsides of SFL include:<u></u><u></u></span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">1. It seems that the cur=
rent version of SFL targets at end-to-end performance measurement, =C2=A0bu=
t our draft targets at both end-to-end and hop-by-hop performance measureme=
nt. Of course, someone may argue that the
 SFL can be extended to support hop-by-hop performance measurement, but if =
that happens, the SFL method is too complex for label management, because b=
asically=C2=A0it assigns two implications to one mpls label.<u></u><u></u><=
/span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">2. The SFL method can&#3=
9;t be applied when we want to achieve performance measurements on both LSP=
 and PW=C2=A0synchronously, but the method described in our draft can simpl=
y=C2=A0achieve that.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">It appears that the label below the </span>=E2=80=9C<s=
pan lang=3D"EN-US">Flow Indicator Label</span>=E2=80=9D<span lang=3D"EN-US"=
> is used to carry/embed context information: including a flow identifier a=
nd additional flags - that are set by ingress. Normally,
 MPLS labels do not embed any context information about the flow they carry=
 within them. The context of the label is held by the node that allocates t=
he label.<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Your u=
nderstanding is=C2=A0perfectly correct. And please also note that in our dr=
aft the Flow-ID label values are allocated by an external NMS or a controll=
er, that means the context of the Flow-ID label
 is held by all the nodes within the administrative domain. Furthermore, I =
want to stress that the method described in our draft has already been impl=
emented by more than two vendors, and we plan to deploy it in our=C2=A0comm=
ercial 5G backhaul networks.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Tarek<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">_______________________________=
________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Mon, 18 Nov 2019 07:05:12 +0800
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To: Tarek Saad <tsaad.net@gmail.com>
Cc: "draft-gandhi-spring-ioam-sr-mpls@ietf.org" <draft-gandhi-spring-ioam-sr-mpls@ietf.org>,  "mpls@ietf.org" <mpls@ietf.org>
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Subject: Re: [mpls] Comments on draft-gandhi-spring-ioam-sr-mpls
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Hi Tarek,
Thanks for your review comments. Please see replies below:
1) Yes, there is no need to add multiple indicator/special labels. We will
clarify in the draft.
2) Fig 3 is showing the location of the Path Segment wrt Indicator/special
label (this was a comment on the list).

Thanks,
Rakesh




On Mon, Nov 18, 2019 at 12:21 AM Tarek Saad <tsaad.net@gmail.com> wrote:

> Hi authors,
>
>
>
> Having read through this draft, I have the following comments:
>
>
>
>    1. Is it possible that more than one IOAM encapsulating node tries to
>    insert IOAM header into same packet =E2=80=93 e.g. consider hierarchic=
al MPLS
>    LSP(s).. If so, how to handle multiple encapsulating node(s) trying to=
 add
>    IOAM option/data after end of MPLS label stack? If not possible (or no=
t
>    supported), it=E2=80=99d be good to explicitly state this
>    2. It is not clear what Figure 3 is serving in section 4?
>
>
>
> Regards,
>
> Tarek
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr"><div>Hi Tarek,</div><div>Thanks for your review comments. =
Please see replies below:</div><div>1) Yes, there is no need to add multipl=
e indicator/special labels. We will clarify in the draft.</div><div>2) Fig =
3 is showing the location of the Path Segment wrt Indicator/special label (=
this was a comment on the list).</div><div><br></div><div>Thanks,</div><div=
>Rakesh</div><div><br></div><div><br><br></div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Nov 18, 2019 at 12:2=
1 AM Tarek Saad &lt;<a href=3D"mailto:tsaad.net@gmail.com">tsaad.net@gmail.=
com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi authors,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Having read through this draft,=
 I have the following comments:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p>
<ol style=3D"margin-top:0in" type=3D"1" start=3D"1">
<li style=3D"margin-left:0in"><span lang=3D"EN-CA">Is it possible that more=
 than one IOAM encapsulating node tries to insert IOAM header into same pac=
ket =E2=80=93 e.g. consider hierarchical MPLS LSP(s).. If so, how to handle
 multiple encapsulating node(s) trying to add IOAM option/data after end of=
 MPLS label stack? If not possible (or not supported), it=E2=80=99d be good=
 to explicitly state this<u></u><u></u></span></li><li style=3D"margin-left=
:0in"><span lang=3D"EN-CA">It is not clear what Figure 3 is serving in sect=
ion 4?<u></u><u></u></span></li></ol>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Tarek<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p>
</div>
</div>

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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

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Subject: [mpls] I-D Action: draft-ietf-mpls-summary-frr-rsvpte-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : RSVP-TE Summary Fast Reroute Extensions for LSP Tunnels
        Authors         : Mike Taillon
                          Tarek Saad
                          Rakesh Gandhi
                          Abhishek Deshmukh
                          Markus Jork
                          Vishnu Pavan Beeram
	Filename        : draft-ietf-mpls-summary-frr-rsvpte-06.txt
	Pages           : 19
	Date            : 2019-11-17

Abstract:
   This document defines Resource Reservation Protocol (RSVP) Traffic-
   Engineering (TE) signaling extensions that reduce the amount of RSVP
   signaling required for Fast Reroute (FRR) procedures and subsequently
   improve the scalability of the RSVP-TE signaling when undergoing FRR
   convergence after a link or node failure.  Such extensions allow the
   RSVP message exchange between the Point of Local Repair (PLR) and the
   Merge Point (MP) to be independent of the number of protected Label
   Switched Paths (LSPs) traversing between them when facility bypass
   FRR protection is used.  The signaling extensions are fully backwards
   compatible with nodes that do not support them.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-summary-frr-rsvpte/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-summary-frr-rsvpte-06
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-summary-frr-rsvpte-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-summary-frr-rsvpte-06


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
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From: Tarek Saad <tsaad.net@gmail.com>
To: "Zafar Ali (zali)" <zali@cisco.com>, "naikumar@cisco.com" <naikumar@cisco.com>
CC: "mpls@ietf.org" <mpls@ietf.org>, "draft-nainar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org" <draft-nainar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org>
Thread-Topic: Comments on draft-nainar-mpls-spring-lsp-ping-sr-generic-sid
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Subject: Re: [mpls] Comments on draft-nainar-mpls-spring-lsp-ping-sr-generic-sid
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Hi authors,

Resending some comments from last time and adding one more:
Can you comment on what validation checks are possible with this approach i=
n case there=92s an incoming label collision for multiple SR FECs (as descr=
ibed in in draft-ietf-spring-segment-routing-mpls section 2.5)?

Regards,
Tarek

From: Tarek Saad <tsaad.net@gmail.com>
Date: Monday, July 22, 2019 at 9:17 PM
To: "draft-nainar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org" <draft-nain=
ar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org>
Cc: "mpls@ietf.org" <mpls@ietf.org>
Subject: Comments on draft-nainar-mpls-spring-lsp-ping-sr-generic-sid

Hi authors,

I read through this draft and need some clarification.
      *  Else:

         +  Set the Best-return-code to 10 when the index derived from
            the label at Label-stack-depth is not advertised by LSP End
            Point.

The procedure above seems to hint that a transit node (e.g. for a traced no=
de SID) will have to derive the SR index from the SRGL SID (as absolute lab=
el) so it can do further local validation? If my understanding is correct,

1.      How does the node know deterministically that the SRGL SID is for a=
 remote prefix SID -- so it can do this derivation?

2.      I presume there is an assumption that R8=92s SRGB is known to all t=
ransit SR nodes along the path so index can be derived? I=92m not sure the =
condition will always be true -- e.g. what about inter-area case? Also, wha=
t about BGP prefix SIDs?

3.      What happens if R8 is non SR capable (e.g. runs LDP) and SRMS is ad=
vertising the prefix SID on its behalf =96 i.e R8 never advertises an SRGB?

As comparison, RFC8287 suggests to carry the (i.e. node/prefix of R8) in th=
e prefix SID Target FEC Stack and any transit node can easily do local vali=
dation in the respective protocol DB (e.g. IGP or BGP).

Regards,
Tarek

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<p class=3D"MsoNormal">Hi authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Resending some comments from last time and adding on=
e more:<o:p></o:p></p>
<p class=3D"MsoNormal">Can you comment on what validation checks are possib=
le with this approach in case there=92s an incoming label collision for mul=
tiple SR FECs (as described in in draft-ietf-spring-segment-routing-mpls se=
ction 2.5)?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Tarek<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"color:b=
lack">From: </span>
</b><span style=3D"color:black">Tarek Saad &lt;tsaad.net@gmail.com&gt;<br>
<b>Date: </b>Monday, July 22, 2019 at 9:17 PM<br>
<b>To: </b>&quot;draft-nainar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org&=
quot; &lt;draft-nainar-mpls-spring-lsp-ping-sr-generic-sid@ietf.org&gt;<br>
<b>Cc: </b>&quot;mpls@ietf.org&quot; &lt;mpls@ietf.org&gt;<br>
<b>Subject: </b>Comments on draft-nainar-mpls-spring-lsp-ping-sr-generic-si=
d<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi authors,<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">I read through this draft=
 and need some clarification.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; *&nbsp; Else:</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;</span><o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;&nbsp; Set the Best-return-code to 10
<span style=3D"background:yellow">when the index derived from</span></span>=
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black;background:yellow">&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the label=
 at Label-stack-depth</span><span style=3D"font-size:10.0pt;font-family:&qu=
ot;Courier New&quot;;color:black"> is not
 advertised by LSP End</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Point.</span><o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">The procedure above seems=
 to hint that a transit node (e.g. for a traced node SID) will have to deri=
ve the SR index from the SRGL SID (as absolute label) so it can do further =
local validation? If my understanding
 is correct,<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>How does the node know deterministically that the S=
RGL SID is for a remote prefix SID -- so it can do this derivation?<o:p></o=
:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>I presume there is an assumption that R8=92s SRGB i=
s known to all transit SR nodes along the path so index can be derived? I=
=92m not sure the condition will always be true -- e.g. what about inter-ar=
ea case? Also, what about BGP prefix SIDs?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">3.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What happens if R8 is non SR capable (e.g. runs LDP=
) and SRMS is advertising the prefix SID on its behalf =96 i.e R8 never adv=
ertises an SRGB?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">As comparison, RFC8287 su=
ggests to carry the (i.e. node/prefix of R8) in the prefix SID Target FEC S=
tack and any transit node can easily do local validation in the respective =
protocol DB (e.g. IGP or BGP).<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Tarek<o:p></o:p></p>
</div>
</div>
</body>
</html>

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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Mon, 18 Nov 2019 14:56:39 +0800
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To: Tianran Zhou <zhoutianran@huawei.com>
Cc: Weiqiang Cheng <chengweiqiang@chinamobile.com>, Tarek Saad <tsaad.net@gmail.com>,  "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>,  "mpls@ietf.org" <mpls@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/f_LbYHWKnvdYaOkDOLFhLnKvcPY>
Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Tianran,
Thanks for your reply. But this does not answer my question:)
Question is why a light way is required when there is already direct export
IOAM available.

Regarding the SFL comment, when SFLs are used, we do not need L/D flags in
the header for coloring, as an SFL itself indicates the color.

Thanks,
Rakesh


On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou <zhoutianran@huawei.com> wrote=
:

> Hi Rakesh,
>
>
>
> Thanks for your interest.
>
> I think the requirement of using alternate marking for mpls pm has alread=
y
> been acknowledged by this wg. As Tarek mentioned several times, the SFL i=
s
> produced for this usage.
>
> We bring a new encapsulation here to mitigate the deployment issue when w=
e
> try to apply the SFL.
>
> That=E2=80=99s our simple motivation.
>
>
>
> BR,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail.c=
om]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=E6=97=
=A5 6:20
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Tianran Zhou <zhoutianran@huawei.com>
> *=E6=8A=84=E9=80=81:* Weiqiang Cheng <chengweiqiang@chinamobile.com>; Tar=
ek Saad <
> tsaad.net@gmail.com>; draft-cheng-mpls-inband-pm-encapsulation@ietf.org;
> mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Tianran,
>
> Thanks for your reply.
>
> Right, IOAM Direct Export covers more than just PM. Both drafts would als=
o
> require special labels for the direct export for MPLS case. With this in
> mind, you may clarify in the draft why lite way is required for PM for MP=
LS
> case and how it is achieved with your draft compared to the IOAM direct
> export.
>
> Thanks,
>
> Rakesh
>
>
>
>
>
>
>
>
>
> On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou <zhoutianran@huawei.com>
> wrote:
>
> Hi Rakesh,
>
>
>
> As the coauthor of both drafts, I think they are different.
>
> This draft is only for performance measurement in a lite way.
>
> IOAM-DEX is to collect data based on the trace type instruction.
>
>
>
> Thanks,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail=
.com]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:* 2019=E5=B9=B411=E6=9C=8813=E6=
=97=A5 5:12
> *=E6=94=B6=E4=BB=B6=E4=BA=BA**:* Weiqiang Cheng <chengweiqiang@chinamobil=
e.com>
> *=E6=8A=84=E9=80=81**:* Tarek Saad <tsaad.net@gmail.com>;
> draft-cheng-mpls-inband-pm-encapsulation@ietf.org; mpls@ietf.org
> *=E4=B8=BB=E9=A2=98**:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Authors,
>
> FYI:
>
> The draft has some similarity with the functionality defined in the
> following draft which is generically applicable to the all encap types:
>
>
>
> https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
>
>
>
> You may want to have a look.
>
>
>
> Thanks,
>
> Rakesh
>
>
>
>
>
>
>
>
>
> On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng <
> chengweiqiang@chinamobile.com> wrote:
>
> Hi Tarek,
>
> Thank you very much for your comments.
>
> We authors had some discussion on it and our feedback is in-line.
>
>
>
> B.R.
>
> Weiqiang Cheng
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls [mailto:mpls-bounces@ietf.org] *=E4=
=BB=A3=E8=A1=A8 *Tarek Saad
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B47=E6=9C=8822=E6=97=
=A5 21:34
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-cheng-mpls-inband-pm-encapsulation@i=
etf.org
> *=E6=8A=84=E9=80=81:* mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* [mpls] Comments on draft draft-cheng-mpls-inband-pm=
-encapsulation
>
>
>
> Hi authors,
>
>
>
> From reading your draft, have the following comments:
>
>    - There=E2=80=99s a similar proposal in draft-ietf-mpls-rfc6374-sfl th=
at the
>    WG has worked on to achieve similar PM measurements. That proposal did=
 not
>    require a special label, nor requires carrying 2 new additional labels=
 in
>    label stack. Do you see any downside to the approach in
>    draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can=
 this
>    be highlighted.
>
> [Weiqiang]   Yes, the SFL proposal was carefully considered before this
> draft was written, and the major downsides of SFL include:
>
> 1. It seems that the current version of SFL targets at end-to-end
> performance measurement,  but our draft targets at both end-to-end and
> hop-by-hop performance measurement. Of course, someone may argue that the
> SFL can be extended to support hop-by-hop performance measurement, but if
> that happens, the SFL method is too complex for label management, because
> basically it assigns two implications to one mpls label.
>
> 2. The SFL method can't be applied when we want to achieve performance
> measurements on both LSP and PW synchronously, but the method described i=
n
> our draft can simply achieve that.
>
>
>
>    - It appears that the label below the =E2=80=9CFlow Indicator Label=E2=
=80=9D is used
>    to carry/embed context information: including a flow identifier and
>    additional flags - that are set by ingress. Normally, MPLS labels do n=
ot
>    embed any context information about the flow they carry within them. T=
he
>    context of the label is held by the node that allocates the label.
>
> [Weiqiang]   Your understanding is perfectly correct. And please also not=
e
> that in our draft the Flow-ID label values are allocated by an external N=
MS
> or a controller, that means the context of the Flow-ID label is held by a=
ll
> the nodes within the administrative domain. Furthermore, I want to stress
> that the method described in our draft has already been implemented by mo=
re
> than two vendors, and we plan to deploy it in our commercial 5G backhaul
> networks.
>
>
>
>
>
> Regards,
>
> Tarek
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>

--000000000000beae720597997326
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Tianran,</div><div>Thanks for your reply. But this=
 does not answer my question:)<br></div><div>Question is why a light way is=
 required when there is already direct export IOAM available.<br></div><div=
><br></div><div>Regarding the SFL comment, when SFLs are used, we do not ne=
ed L/D flags in the header for coloring, as an SFL itself indicates the col=
or.</div><div><br></div><div>Thanks,</div><div>Rakesh</div><div><br></div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou &lt;<a href=3D"mailto:zhoutianr=
an@huawei.com">zhoutianran@huawei.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">





<div lang=3D"ZH-CN">
<div class=3D"gmail-m_-2012734969381414885WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Hi Rakesh,<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Thanks for your=
 interest.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">I think the req=
uirement of using alternate marking for mpls pm has already been acknowledg=
ed by this wg. As Tarek mentioned several times, the SFL
 is produced for this usage.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">We bring a new =
encapsulation here to mitigate the deployment issue when we try to apply th=
e SFL.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">That=E2=80=99s =
our simple motivation.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">BR,<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Tianran<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;\=
005fae\008f6f\0096c5\009ed1&quot;,sans-serif">=E5=8F=91=E4=BB=B6=E4=BA=BA<s=
pan lang=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-fa=
mily:&quot;\005fae\008f6f\0096c5\009ed1&quot;,sans-serif" lang=3D"EN-US"> R=
akesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"_b=
lank">rgandhi.ietf@gmail.com</a>]
<br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;\005fae\008f6f\00=
96c5\009ed1&quot;,sans-serif">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lan=
g=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-family:&q=
uot;\005fae\008f6f\0096c5\009ed1&quot;,sans-serif" lang=3D"EN-US"> 2019</sp=
an><span style=3D"font-size:11pt;font-family:&quot;\005fae\008f6f\0096c5\00=
9ed1&quot;,sans-serif">=E5=B9=B4<span lang=3D"EN-US">11</span>=E6=9C=88<spa=
n lang=3D"EN-US">18</span>=E6=97=A5<span lang=3D"EN-US">
 6:20<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com"=
 target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com"=
 target=3D"_blank">chengweiqiang@chinamobile.com</a>&gt;; Tarek Saad &lt;<a=
 href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank">tsaad.net@gmail.com<=
/a>&gt;; <a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.or=
g" target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>;=
 <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulati=
on<u></u><u></u></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Tianran,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks for your reply.<u></u><u=
></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Right, IOAM Direct Export cover=
s more than just PM. Both drafts would also require special labels for the =
direct export for MPLS case. With this in mind, you may clarify in the draf=
t why lite way is required for PM for
 MPLS case and how it is achieved with your draft compared to the IOAM dire=
ct export.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rakesh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Sun, Nov 17, 2019 at 12:44 P=
M Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Hi Rakesh,</spa=
n><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><s=
pan lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">As the coauthor=
 of both drafts, I think they are different.</span><span lang=3D"EN-US"><u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">This draft is o=
nly for performance measurement in a lite way.</span><span lang=3D"EN-US"><=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">IOAM-DEX is to =
collect data based on the trace type instruction.</span><span lang=3D"EN-US=
"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><s=
pan lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Thanks,</span><=
span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Tianran</span><=
span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><s=
pan lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Aria=
l&quot;,sans-serif" lang=3D"EN-US">:</span></b><span style=3D"font-size:11p=
t;font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-US">
 Rakesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"=
_blank">rgandhi.ietf@gmail.com</a>]
<br>
</span><b><span style=3D"font-size:11pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Arial&quot=
;,sans-serif" lang=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font=
-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-US"> 2019</span><span styl=
e=3D"font-size:11pt">=E5=B9=B4</span><span style=3D"font-size:11pt;font-fam=
ily:&quot;Arial&quot;,sans-serif" lang=3D"EN-US">11</span><span style=3D"fo=
nt-size:11pt">=E6=9C=88</span><span style=3D"font-size:11pt;font-family:&qu=
ot;Arial&quot;,sans-serif" lang=3D"EN-US">13</span><span style=3D"font-size=
:11pt">=E6=97=A5</span><span style=3D"font-size:11pt;font-family:&quot;Aria=
l&quot;,sans-serif" lang=3D"EN-US">
 5:12<br>
</span><b><span style=3D"font-size:11pt">=E6=94=B6=E4=BB=B6=E4=BA=BA</span>=
</b><b><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-ser=
if" lang=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font-family:&q=
uot;Arial&quot;,sans-serif" lang=3D"EN-US"> Weiqiang Cheng &lt;<a href=3D"m=
ailto:chengweiqiang@chinamobile.com" target=3D"_blank">chengweiqiang@chinam=
obile.com</a>&gt;<br>
</span><b><span style=3D"font-size:11pt">=E6=8A=84=E9=80=81</span></b><b><s=
pan style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif" lang=
=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font-family:&quot;Aria=
l&quot;,sans-serif" lang=3D"EN-US"> Tarek Saad &lt;<a href=3D"mailto:tsaad.=
net@gmail.com" target=3D"_blank">tsaad.net@gmail.com</a>&gt;;
<a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" target=
=3D"_blank">
draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>; <a href=3D"mailto:mp=
ls@ietf.org" target=3D"_blank">
mpls@ietf.org</a><br>
</span><b><span style=3D"font-size:11pt">=E4=B8=BB=E9=A2=98</span></b><b><s=
pan style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif" lang=
=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font-family:&quot;Aria=
l&quot;,sans-serif" lang=3D"EN-US"> Re: [mpls] Comments on draft draft-chen=
g-mpls-inband-pm-encapsulation</span><span lang=3D"EN-US"><u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Authors,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">FYI:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft has some similarity w=
ith the functionality defined in the following draft which is generically a=
pplicable to the all encap types:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ioamteam-ippm-ioam-direct-export-00" target=3D"_blank">https:=
//tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00</a><u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You may want to have a look.<u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rakesh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Wed, Sep 25, 2019 at 3:00 AM=
 Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com" target=
=3D"_blank">chengweiqiang@chinamobile.com</a>&gt; wrote:<u></u><u></u></spa=
n></p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Hi Tarek,</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Thank you very much for your comments.</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">We authors had some discussion on it and our feedback is i=
n-line.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">B.R.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Weiqiang Cheng</span><span lang=3D"EN-US"><u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:1=
0pt" lang=3D"EN-US"> mpls [mailto:</span><span lang=3D"EN-US"><a href=3D"ma=
ilto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D"font-size:10pt=
">mpls-bounces@ietf.org</span></a></span><span style=3D"font-size:10pt" lan=
g=3D"EN-US">]
</span><b><span style=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 </span></b><spa=
n style=3D"font-size:10pt" lang=3D"EN-US">Tarek Saad<br>
</span><b><span style=3D"font-size:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:10pt" l=
ang=3D"EN-US"> 2019</span><span style=3D"font-size:10pt">=E5=B9=B4<span lan=
g=3D"EN-US">7</span>=E6=9C=88<span lang=3D"EN-US">22</span>=E6=97=A5<span l=
ang=3D"EN-US"> 21:34<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> </span></span><span lang=3D"EN-US"><a href=3D"mailto:draft=
-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_blank"><span style=
=3D"font-size:10pt">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</span=
></a></span><span style=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E6=8A=84=E9=80=81<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US">
</span><span lang=3D"EN-US"><a href=3D"mailto:mpls@ietf.org" target=3D"_bla=
nk"><span style=3D"font-size:10pt">mpls@ietf.org</span></a></span><span sty=
le=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E4=B8=BB=E9=A2=98<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US"> [mpl=
s] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</span><span l=
ang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi authors,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">From reading your draft, have t=
he following comments:<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">There</span>=E2=80=99<span lang=3D"EN-US">s a similar =
proposal in draft-ietf-mpls-rfc6374-sfl that the WG has worked on to achiev=
e similar PM measurements. That proposal did not require a special label, n=
or requires carrying 2 new additional labels
 in label stack. Do you see any downside to the approach in draft-ietf-mpls=
-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted=
.<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Yes, t=
he SFL proposal was carefully considered before this draft was written, and=
 the major downsides of SFL include:<u></u><u></u></span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">1. It seems that the cur=
rent version of SFL targets at end-to-end performance measurement, =C2=A0bu=
t our draft targets at both end-to-end and hop-by-hop performance measureme=
nt. Of course, someone may argue that the
 SFL can be extended to support hop-by-hop performance measurement, but if =
that happens, the SFL method is too complex for label management, because b=
asically=C2=A0it assigns two implications to one mpls label.<u></u><u></u><=
/span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">2. The SFL method can&#3=
9;t be applied when we want to achieve performance measurements on both LSP=
 and PW=C2=A0synchronously, but the method described in our draft can simpl=
y=C2=A0achieve that.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">It appears that the label below the </span>=E2=80=9C<s=
pan lang=3D"EN-US">Flow Indicator Label</span>=E2=80=9D<span lang=3D"EN-US"=
> is used to carry/embed context information: including a flow identifier a=
nd additional flags - that are set by ingress. Normally,
 MPLS labels do not embed any context information about the flow they carry=
 within them. The context of the label is held by the node that allocates t=
he label.<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Your u=
nderstanding is=C2=A0perfectly correct. And please also note that in our dr=
aft the Flow-ID label values are allocated by an external NMS or a controll=
er, that means the context of the Flow-ID label
 is held by all the nodes within the administrative domain. Furthermore, I =
want to stress that the method described in our draft has already been impl=
emented by more than two vendors, and we plan to deploy it in our=C2=A0comm=
ercial 5G backhaul networks.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Tarek<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">_______________________________=
________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

--000000000000beae720597997326--


From nobody Sun Nov 17 23:07:36 2019
Return-Path: <gregimirsky@gmail.com>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 18 Nov 2019 15:07:18 +0800
Message-ID: <CA+RyBmXpKbWq-qVu1R92zkg2BLj3Cfr5peUqXam2sxYjEVEC6w@mail.gmail.com>
To: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Cc: Tianran Zhou <zhoutianran@huawei.com>, "mpls@ietf.org" <mpls@ietf.org>,  "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/Olsfv9kwx7i3BVZgvXZtI3Lswho>
Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Rakesh, et al.,
I don't consider AltMark/SFL as just a lighter version of DEX. One of the
benefits of Alt.Marking, in my opinion, is that a node may be aggregating
measurements, and export not the raw data, as with DEX, but calculated
performance metrics.

Regards,
Greg

On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi <rgandhi.ietf@gmail.com>
wrote:

> Hi Tianran,
> Thanks for your reply. But this does not answer my question:)
> Question is why a light way is required when there is already direct
> export IOAM available.
>
> Regarding the SFL comment, when SFLs are used, we do not need L/D flags i=
n
> the header for coloring, as an SFL itself indicates the color.
>
> Thanks,
> Rakesh
>
>
> On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou <zhoutianran@huawei.com>
> wrote:
>
>> Hi Rakesh,
>>
>>
>>
>> Thanks for your interest.
>>
>> I think the requirement of using alternate marking for mpls pm has
>> already been acknowledged by this wg. As Tarek mentioned several times, =
the
>> SFL is produced for this usage.
>>
>> We bring a new encapsulation here to mitigate the deployment issue when
>> we try to apply the SFL.
>>
>> That=E2=80=99s our simple motivation.
>>
>>
>>
>> BR,
>>
>> Tianran
>>
>>
>>
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail.=
com]
>> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=E6=97=
=A5 6:20
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Tianran Zhou <zhoutianran@huawei.com>
>> *=E6=8A=84=E9=80=81:* Weiqiang Cheng <chengweiqiang@chinamobile.com>; Ta=
rek Saad <
>> tsaad.net@gmail.com>; draft-cheng-mpls-inband-pm-encapsulation@ietf.org;
>> mpls@ietf.org
>> *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
>> draft-cheng-mpls-inband-pm-encapsulation
>>
>>
>>
>> Hi Tianran,
>>
>> Thanks for your reply.
>>
>> Right, IOAM Direct Export covers more than just PM. Both drafts would
>> also require special labels for the direct export for MPLS case. With th=
is
>> in mind, you may clarify in the draft why lite way is required for PM fo=
r
>> MPLS case and how it is achieved with your draft compared to the IOAM
>> direct export.
>>
>> Thanks,
>>
>> Rakesh
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou <zhoutianran@huawei.com>
>> wrote:
>>
>> Hi Rakesh,
>>
>>
>>
>> As the coauthor of both drafts, I think they are different.
>>
>> This draft is only for performance measurement in a lite way.
>>
>> IOAM-DEX is to collect data based on the trace type instruction.
>>
>>
>>
>> Thanks,
>>
>> Tianran
>>
>>
>>
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Rakesh Gandhi [mailto:rgandhi.ietf@gmai=
l.com]
>> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:* 2019=E5=B9=B411=E6=9C=8813=E6=
=97=A5 5:12
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA**:* Weiqiang Cheng <chengweiqiang@chinamobi=
le.com>
>> *=E6=8A=84=E9=80=81**:* Tarek Saad <tsaad.net@gmail.com>;
>> draft-cheng-mpls-inband-pm-encapsulation@ietf.org; mpls@ietf.org
>> *=E4=B8=BB=E9=A2=98**:* Re: [mpls] Comments on draft
>> draft-cheng-mpls-inband-pm-encapsulation
>>
>>
>>
>> Hi Authors,
>>
>> FYI:
>>
>> The draft has some similarity with the functionality defined in the
>> following draft which is generically applicable to the all encap types:
>>
>>
>>
>> https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
>>
>>
>>
>> You may want to have a look.
>>
>>
>>
>> Thanks,
>>
>> Rakesh
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng <
>> chengweiqiang@chinamobile.com> wrote:
>>
>> Hi Tarek,
>>
>> Thank you very much for your comments.
>>
>> We authors had some discussion on it and our feedback is in-line.
>>
>>
>>
>> B.R.
>>
>> Weiqiang Cheng
>>
>>
>>
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls [mailto:mpls-bounces@ietf.org] *=E4=
=BB=A3=E8=A1=A8 *Tarek Saad
>> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B47=E6=9C=8822=E6=97=
=A5 21:34
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-cheng-mpls-inband-pm-encapsulation@=
ietf.org
>> *=E6=8A=84=E9=80=81:* mpls@ietf.org
>> *=E4=B8=BB=E9=A2=98:* [mpls] Comments on draft draft-cheng-mpls-inband-p=
m-encapsulation
>>
>>
>>
>> Hi authors,
>>
>>
>>
>> From reading your draft, have the following comments:
>>
>>    - There=E2=80=99s a similar proposal in draft-ietf-mpls-rfc6374-sfl t=
hat the
>>    WG has worked on to achieve similar PM measurements. That proposal di=
d not
>>    require a special label, nor requires carrying 2 new additional label=
s in
>>    label stack. Do you see any downside to the approach in
>>    draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, ca=
n this
>>    be highlighted..
>>
>> [Weiqiang]   Yes, the SFL proposal was carefully considered before this
>> draft was written, and the major downsides of SFL include:
>>
>> 1. It seems that the current version of SFL targets at end-to-end
>> performance measurement,  but our draft targets at both end-to-end and
>> hop-by-hop performance measurement. Of course, someone may argue that th=
e
>> SFL can be extended to support hop-by-hop performance measurement, but i=
f
>> that happens, the SFL method is too complex for label management, becaus=
e
>> basically it assigns two implications to one mpls label.
>>
>> 2. The SFL method can't be applied when we want to achieve performance
>> measurements on both LSP and PW synchronously, but the method described =
in
>> our draft can simply achieve that.
>>
>>
>>
>>    - It appears that the label below the =E2=80=9CFlow Indicator Label=
=E2=80=9D is used
>>    to carry/embed context information: including a flow identifier and
>>    additional flags - that are set by ingress. Normally, MPLS labels do =
not
>>    embed any context information about the flow they carry within them. =
The
>>    context of the label is held by the node that allocates the label.
>>
>> [Weiqiang]   Your understanding is perfectly correct. And please also
>> note that in our draft the Flow-ID label values are allocated by an
>> external NMS or a controller, that means the context of the Flow-ID labe=
l
>> is held by all the nodes within the administrative domain. Furthermore, =
I
>> want to stress that the method described in our draft has already been
>> implemented by more than two vendors, and we plan to deploy it in
>> our commercial 5G backhaul networks.
>>
>>
>>
>>
>>
>> Regards,
>>
>> Tarek
>>
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>
>> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Hi Rakesh, et al.,<div>I don&#39;t consider AltMark/SFL as=
 just a lighter version of DEX. One of the benefits of Alt.Marking, in my o=
pinion, is that a node may be aggregating measurements, and export not the =
raw data, as with DEX, but calculated performance metrics.</div><div><br></=
div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Nov 18, 2019 at 2:57 PM Rakes=
h Gandhi &lt;<a href=3D"mailto:rgandhi.ietf@gmail.com">rgandhi.ietf@gmail.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr"><div>Hi Tianran,</div><div>Thanks for your reply. But th=
is does not answer my question:)<br></div><div>Question is why a light way =
is required when there is already direct export IOAM available.<br></div><d=
iv><br></div><div>Regarding the SFL comment, when SFLs are used, we do not =
need L/D flags in the header for coloring, as an SFL itself indicates the c=
olor.</div><div><br></div><div>Thanks,</div><div>Rakesh</div><div><br></div=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"=
>On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou &lt;<a href=3D"mailto:zhoutia=
nran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"ZH-CN">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Hi Rakesh,<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Thanks for your interest.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">I think the requirement of =
using alternate marking for mpls pm has already been acknowledged by this w=
g. As Tarek mentioned several times, the SFL
 is produced for this usage.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">We bring a new encapsulatio=
n here to mitigate the deployment issue when we try to apply the SFL.<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">That=E2=80=99s our simple m=
otivation.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">BR,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Tianran<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span>=
</p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:=E5=BE=
=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif">=E5=8F=91=E4=BB=B6=E4=BA=BA<span=
 lang=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-famil=
y:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif" lang=3D"EN-US"> Rakesh G=
andhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"_blank">r=
gandhi.ietf@gmail.com</a>]
<br>
</span><b><span style=3D"font-size:11pt;font-family:=E5=BE=AE=E8=BD=AF=E9=
=9B=85=E9=BB=91,sans-serif">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=
=3D"EN-US">:</span></span></b><span style=3D"font-size:11pt;font-family:=E5=
=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif" lang=3D"EN-US"> 2019</span><s=
pan style=3D"font-size:11pt;font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=
=91,sans-serif">=E5=B9=B4<span lang=3D"EN-US">11</span>=E6=9C=88<span lang=
=3D"EN-US">18</span>=E6=97=A5<span lang=3D"EN-US">
 6:20<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com"=
 target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com"=
 target=3D"_blank">chengweiqiang@chinamobile.com</a>&gt;; Tarek Saad &lt;<a=
 href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank">tsaad.net@gmail.com<=
/a>&gt;; <a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.or=
g" target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>;=
 <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulati=
on<u></u><u></u></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Tianran,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks for your reply.<u></u><u=
></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Right, IOAM Direct Export cover=
s more than just PM. Both drafts would also require special labels for the =
direct export for MPLS case. With this in mind, you may clarify in the draf=
t why lite way is required for PM for
 MPLS case and how it is achieved with your draft compared to the IOAM dire=
ct export.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rakesh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Sun, Nov 17, 2019 at 12:44 P=
M Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Hi Rakesh,</span><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><span lang=3D"=
EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">As the coauthor of both dra=
fts, I think they are different.</span><span lang=3D"EN-US"><u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">This draft is only for perf=
ormance measurement in a lite way.</span><span lang=3D"EN-US"><u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">IOAM-DEX is to collect data=
 based on the trace type instruction.</span><span lang=3D"EN-US"><u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><span lang=3D"=
EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Thanks,</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">Tianran</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><span lang=3D"=
EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA</span></b><b><span style=3D"font-size:11pt;font-family:Arial,sans=
-serif" lang=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font-famil=
y:Arial,sans-serif" lang=3D"EN-US">
 Rakesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"=
_blank">rgandhi.ietf@gmail.com</a>]
<br>
</span><b><span style=3D"font-size:11pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4</span></b><b><span style=3D"font-size:11pt;font-family:Arial,sans-serif=
" lang=3D"EN-US">:</span></b><span style=3D"font-size:11pt;font-family:Aria=
l,sans-serif" lang=3D"EN-US"> 2019</span><span style=3D"font-size:11pt">=E5=
=B9=B4</span><span style=3D"font-size:11pt;font-family:Arial,sans-serif" la=
ng=3D"EN-US">11</span><span style=3D"font-size:11pt">=E6=9C=88</span><span =
style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=3D"EN-US">13</sp=
an><span style=3D"font-size:11pt">=E6=97=A5</span><span style=3D"font-size:=
11pt;font-family:Arial,sans-serif" lang=3D"EN-US">
 5:12<br>
</span><b><span style=3D"font-size:11pt">=E6=94=B6=E4=BB=B6=E4=BA=BA</span>=
</b><b><span style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=3D"=
EN-US">:</span></b><span style=3D"font-size:11pt;font-family:Arial,sans-ser=
if" lang=3D"EN-US"> Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chin=
amobile.com" target=3D"_blank">chengweiqiang@chinamobile.com</a>&gt;<br>
</span><b><span style=3D"font-size:11pt">=E6=8A=84=E9=80=81</span></b><b><s=
pan style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=3D"EN-US">:<=
/span></b><span style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=
=3D"EN-US"> Tarek Saad &lt;<a href=3D"mailto:tsaad.net@gmail.com" target=3D=
"_blank">tsaad.net@gmail.com</a>&gt;;
<a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" target=
=3D"_blank">
draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>; <a href=3D"mailto:mp=
ls@ietf.org" target=3D"_blank">
mpls@ietf.org</a><br>
</span><b><span style=3D"font-size:11pt">=E4=B8=BB=E9=A2=98</span></b><b><s=
pan style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=3D"EN-US">:<=
/span></b><span style=3D"font-size:11pt;font-family:Arial,sans-serif" lang=
=3D"EN-US"> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsu=
lation</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Authors,<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">FYI:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft has some similarity w=
ith the functionality defined in the following draft which is generically a=
pplicable to the all encap types:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ioamteam-ippm-ioam-direct-export-00" target=3D"_blank">https:=
//tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00</a><u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You may want to have a look.<u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rakesh<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Wed, Sep 25, 2019 at 3:00 AM=
 Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com" target=
=3D"_blank">chengweiqiang@chinamobile.com</a>&gt; wrote:<u></u><u></u></spa=
n></p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Hi Tarek,</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Thank you very much for your comments.</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">We authors had some discussion on it and our feedback is i=
n-line.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">B.R.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">Weiqiang Cheng</span><span lang=3D"EN-US"><u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:1=
0pt" lang=3D"EN-US"> mpls [mailto:</span><span lang=3D"EN-US"><a href=3D"ma=
ilto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D"font-size:10pt=
">mpls-bounces@ietf.org</span></a></span><span style=3D"font-size:10pt" lan=
g=3D"EN-US">]
</span><b><span style=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 </span></b><spa=
n style=3D"font-size:10pt" lang=3D"EN-US">Tarek Saad<br>
</span><b><span style=3D"font-size:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"font-size:10pt" l=
ang=3D"EN-US"> 2019</span><span style=3D"font-size:10pt">=E5=B9=B4<span lan=
g=3D"EN-US">7</span>=E6=9C=88<span lang=3D"EN-US">22</span>=E6=97=A5<span l=
ang=3D"EN-US"> 21:34<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> </span></span><span lang=3D"EN-US"><a href=3D"mailto:draft=
-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_blank"><span style=
=3D"font-size:10pt">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</span=
></a></span><span style=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E6=8A=84=E9=80=81<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US">
</span><span lang=3D"EN-US"><a href=3D"mailto:mpls@ietf.org" target=3D"_bla=
nk"><span style=3D"font-size:10pt">mpls@ietf.org</span></a></span><span sty=
le=3D"font-size:10pt" lang=3D"EN-US"><br>
</span><b><span style=3D"font-size:10pt">=E4=B8=BB=E9=A2=98<span lang=3D"EN=
-US">:</span></span></b><span style=3D"font-size:10pt" lang=3D"EN-US"> [mpl=
s] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</span><span l=
ang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi authors,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">From reading your draft, have t=
he following comments:<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">There</span>=E2=80=99<span lang=3D"EN-US">s a similar =
proposal in draft-ietf-mpls-rfc6374-sfl that the WG has worked on to achiev=
e similar PM measurements. That proposal did not require a special label, n=
or requires carrying 2 new additional labels
 in label stack. Do you see any downside to the approach in draft-ietf-mpls=
-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted=
..<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Yes, t=
he SFL proposal was carefully considered before this draft was written, and=
 the major downsides of SFL include:<u></u><u></u></span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">1. It seems that the cur=
rent version of SFL targets at end-to-end performance measurement, =C2=A0bu=
t our draft targets at both end-to-end and hop-by-hop performance measureme=
nt. Of course, someone may argue that the
 SFL can be extended to support hop-by-hop performance measurement, but if =
that happens, the SFL method is too complex for label management, because b=
asically=C2=A0it assigns two implications to one mpls label.<u></u><u></u><=
/span></p>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">2. The SFL method can&#3=
9;t be applied when we want to achieve performance measurements on both LSP=
 and PW=C2=A0synchronously, but the method described in our draft can simpl=
y=C2=A0achieve that.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">It appears that the label below the </span>=E2=80=9C<s=
pan lang=3D"EN-US">Flow Indicator Label</span>=E2=80=9D<span lang=3D"EN-US"=
> is used to carry/embed context information: including a flow identifier a=
nd additional flags - that are set by ingress. Normally,
 MPLS labels do not embed any context information about the flow they carry=
 within them. The context of the label is held by the node that allocates t=
he label.<u></u><u></u></span></li></ul>
<p style=3D"margin-left:36pt"><span lang=3D"EN-US">[Weiqiang] =C2=A0 Your u=
nderstanding is=C2=A0perfectly correct. And please also note that in our dr=
aft the Flow-ID label values are allocated by an external NMS or a controll=
er, that means the context of the Flow-ID label
 is held by all the nodes within the administrative domain. Furthermore, I =
want to stress that the method described in our draft has already been impl=
emented by more than two vendors, and we plan to deploy it in our=C2=A0comm=
ercial 5G backhaul networks.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
" lang=3D"EN-US">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Tarek<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">_______________________________=
________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

</blockquote></div>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

--000000000000d5df5b059799994b--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/EKxm3Mx9DDYAS31RGi98A2N6B0M>
Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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From nobody Mon Nov 18 01:55:34 2019
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From: Haoyu Song <haoyu.song@futurewei.com>
To: Giuseppe Fioccola <giuseppe.fioccola@huawei.com>, Greg Mirsky <gregimirsky@gmail.com>, Rakesh Gandhi <rgandhi.ietf@gmail.com>
CC: "mpls@ietf.org" <mpls@ietf.org>, "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
Thread-Topic: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Date: Mon, 18 Nov 2019 09:55:22 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/Xy6Kl7ZFYIQt9wBLHmsbKPFCPwc>
Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255);=
 text-align: left;" dir=3D"auto">
I agree the two techniques covers different use cases with different cost. =
Each has its own merits. Sometimes header overhead and data export bandwidt=
h&nbsp; are big concerns.&nbsp; If AM is all user needs, there's&nbsp; no p=
oint to use a more powerful yet more costly technique.&nbsp;</div>
<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255);=
 text-align: left;" dir=3D"auto">
<br>
</div>
<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255);=
 text-align: left;" dir=3D"auto">
Haoyu</div>
<div id=3D"ms-outlook-mobile-signature" dir=3D"auto" style=3D"text-align: l=
eft;">
<div><br>
</div>
<br>
</div>
<div id=3D"id-d1cec3ef-1613-4025-8eb0-9d494f974d3d" class=3D"ms-outlook-mob=
ile-reference-message">
<div style=3D"font-family: sans-serif; font-size: 12pt; color: rgb(0, 0, 0)=
;"><br>
</div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg"><strong>=B7=A2=BC=FE=C8=CB:</strong> mpls &lt;mpl=
s-bounces@ietf.org&gt; =B4=FA=B1=ED Giuseppe Fioccola &lt;giuseppe.fioccola=
@huawei.com&gt;<br>
<strong>=B7=A2=CB=CD=CA=B1=BC=E4:</strong> 2019=C4=EA11=D4=C218=C8=D5=D0=C7=
=C6=DA=D2=BB =CF=C2=CE=E75:17<br>
<strong>=CA=D5=BC=FE=C8=CB:</strong> Greg Mirsky; Rakesh Gandhi<br>
<strong>=B3=AD=CB=CD:</strong> mpls@ietf.org; draft-cheng-mpls-inband-pm-en=
capsulation@ietf.org<br>
<strong>=D6=F7=CC=E2:</strong> Re: [mpls] Comments on draft draft-cheng-mpl=
s-inband-pm-encapsulation<br>
</div>
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Hi All,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">I agree with Greg. And there are at=
 least 3 big differences between IOAM/IOAM-DEX and Alternate Marking:</span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">1) IOAM/IOAM-DEX is a packet level =
monitoring while Alternate Marking is a flow monitoring solution</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">2) IOAM/IOAM-DEX introduces a new e=
ncapsulation while Alternate Marking can be encapsulated more easily and wi=
th less overhead (e.g. dedicated bits or TLV)</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">3) IOAM/IOAM-DEX architecture is mo=
re static (i.e. data specified by the IOAM-Trace-Type are exported by the n=
odes) while Alternate Marking includes a dynamic
 approach and can be adapted to the network conditions (i.e. draft-ietf-ipp=
m-multipoint-alt-mark)</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Best Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Giuseppe</span></p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"font-size=
:11.0pt; font-family:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;<=
/span></a></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt; font-family:&quo=
t;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt=
; font-family:&quot;Calibri&quot;,sans-serif"> mpls [mailto:mpls-bounces@ie=
tf.org]
<b>On Behalf Of </b>Greg Mirsky<br>
<b>Sent:</b> Monday, November 18, 2019 8:07 AM<br>
<b>To:</b> Rakesh Gandhi &lt;rgandhi.ietf@gmail.com&gt;<br>
<b>Cc:</b> mpls@ietf.org; draft-cheng-mpls-inband-pm-encapsulation@ietf.org=
<br>
<b>Subject:</b> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-enc=
apsulation</span></p>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<p class=3D"MsoNormal">Hi Rakesh, et al.,</p>
<div>
<p class=3D"MsoNormal">I don't consider AltMark/SFL as just a lighter versi=
on of DEX. One of the benefits of Alt.Marking, in my opinion, is that a nod=
e may be aggregating measurements, and export not the raw data, as with DEX=
, but calculated performance metrics.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Regards,</p>
</div>
<div>
<p class=3D"MsoNormal">Greg</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi &lt;<a=
 href=3D"mailto:rgandhi.ietf@gmail.com">rgandhi.ietf@gmail.com</a>&gt; wrot=
e:</p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal">Hi Tianran,</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks for your reply. But this does not answer my q=
uestion:)</p>
</div>
<div>
<p class=3D"MsoNormal">Question is why a light way is required when there i=
s already direct export IOAM available.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Regarding the SFL comment, when SFLs are used, we do=
 not need L/D flags in the header for coloring, as an SFL itself indicates =
the color.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,</p>
</div>
<div>
<p class=3D"MsoNormal">Rakesh</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou &lt;<a =
href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei=
.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Hi Rakesh,</span><span s=
tyle=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Thanks for your interest=
.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">I think the requirement =
of using alternate marking for mpls pm has already been acknowledged by thi=
s wg. As Tarek mentioned several times, the SFL
 is produced for this usage.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">We bring a new encapsula=
tion here to mitigate the deployment issue when we try to apply the SFL.</s=
pan><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">That=A1=AFs our simple m=
otivation.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">BR,</span><span style=3D=
""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Tianran</span><span styl=
e=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><b><span lang=3D"ZH-CN" style=3D"font-siz=
e:11.0pt; font-family:&quot;Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=
=C8=CB</span></b><b><span style=3D"font-size:11.0pt; font-family:&quot;Micr=
osoft YaHei&quot;,sans-serif">:</span></b><span style=3D"font-size:11.0pt; =
font-family:&quot;Microsoft YaHei&quot;,sans-serif">
 Rakesh Gandhi [mailto:</span><a href=3D"mailto:rgandhi.ietf@gmail.com" tar=
get=3D"_blank"><span style=3D"font-size:11.0pt; font-family:&quot;Microsoft=
 YaHei&quot;,sans-serif">rgandhi.ietf@gmail.com</span></a><span style=3D"fo=
nt-size:11.0pt; font-family:&quot;Microsoft YaHei&quot;,sans-serif">]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2019<span lang=
=3D"ZH-CN">=C4=EA</span>11<span lang=3D"ZH-CN">=D4=C2</span>18<span lang=3D=
"ZH-CN">=C8=D5</span> 6:20<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> Tianran Zhou &lt;</s=
pan><a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank"><span style=
=3D"font-size:11.0pt; font-family:&quot;Microsoft YaHei&quot;,sans-serif">z=
houtianran@huawei.com</span></a><span style=3D"font-size:11.0pt; font-famil=
y:&quot;Microsoft YaHei&quot;,sans-serif">&gt;<br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> Weiqiang Cheng &lt;</span>=
<a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank"><span st=
yle=3D"font-size:11.0pt; font-family:&quot;Microsoft YaHei&quot;,sans-serif=
">chengweiqiang@chinamobile.com</span></a><span style=3D"font-size:11.0pt; =
font-family:&quot;Microsoft YaHei&quot;,sans-serif">&gt;;
 Tarek Saad &lt;</span><a href=3D"mailto:tsaad.net@gmail.com" target=3D"_bl=
ank"><span style=3D"font-size:11.0pt; font-family:&quot;Microsoft YaHei&quo=
t;,sans-serif">tsaad.net@gmail.com</span></a><span style=3D"font-size:11.0p=
t; font-family:&quot;Microsoft YaHei&quot;,sans-serif">&gt;;
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:11.0pt; font-family:&quot;Micro=
soft YaHei&quot;,sans-serif">draft-cheng-mpls-inband-pm-encapsulation@ietf.=
org</span></a><span style=3D"font-size:11.0pt; font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">;
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:11.0pt; font-family:&quot;Microsoft YaHei&quot;,sans-serif">mpls@ie=
tf.org</span></a><span style=3D"font-size:11.0pt; font-family:&quot;Microso=
ft YaHei&quot;,sans-serif"><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> Re: [mpls] Comments on dra=
ft draft-cheng-mpls-inband-pm-encapsulation</span><span style=3D""></span><=
/p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Hi Tianran,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Thanks for your reply.</=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Right, IOAM Direct Expor=
t covers more than just PM. Both drafts would also require special labels f=
or the direct export for MPLS case. With this in mind, you may clarify in t=
he draft why lite way is required for
 PM for MPLS case and how it is achieved with your draft compared to the IO=
AM direct export.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Thanks,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Rakesh</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">On Sun, Nov 17, 2019 at =
12:44 PM Tianran Zhou &lt;</span><a href=3D"mailto:zhoutianran@huawei.com" =
target=3D"_blank"><span style=3D"">zhoutianran@huawei.com</span></a><span s=
tyle=3D"">&gt; wrote:</span></p>
</div>
<blockquote style=3D"border:none; border-left:solid windowtext 1.0pt; paddi=
ng:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in=
; margin-bottom:5.0pt; border-color:currentcolor currentcolor currentcolor =
rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Hi Rakesh,</span><span s=
tyle=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">As the coauthor of both =
drafts, I think they are different.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">This draft is only for p=
erformance measurement in a lite way.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">IOAM-DEX is to collect d=
ata based on the trace type instruction.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Thanks,</span><span styl=
e=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">Tianran</span><span styl=
e=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; font-fam=
ily:&quot;Calibri&quot;,sans-serif; color:#1F497D">&nbsp;</span><span style=
=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><b><span lang=3D"ZH-CN" style=3D"font-siz=
e:11.0pt; font-family:&quot;Microsoft JhengHei&quot;,sans-serif">=B7=A2=BC=
=FE=C8=CB</span></b><b><span style=3D"font-size:11.0pt; font-family:&quot;A=
rial&quot;,sans-serif">:</span></b><span style=3D"font-size:11.0pt; font-fa=
mily:&quot;Arial&quot;,sans-serif">
 Rakesh Gandhi [mailto:</span><a href=3D"mailto:rgandhi.ietf@gmail.com" tar=
get=3D"_blank"><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quo=
t;,sans-serif">rgandhi.ietf@gmail.com</span></a><span style=3D"font-size:11=
.0pt; font-family:&quot;Arial&quot;,sans-serif">]
<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:11.0pt; font-family:&quot=
;Microsoft JhengHei&quot;,sans-serif">=B7=A2=CB=CD=CA=B1=BC=E4</span></b><b=
><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif"=
>:</span></b><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;=
,sans-serif"> 2019</span><span lang=3D"ZH-CN" style=3D"font-size:11.0pt; fo=
nt-family:&quot;Calibri&quot;,sans-serif">=C4=EA</span><span style=3D"font-=
size:11.0pt; font-family:&quot;Arial&quot;,sans-serif">11</span><span lang=
=3D"ZH-CN" style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-=
serif">=D4=C2</span><span style=3D"font-size:11.0pt; font-family:&quot;Aria=
l&quot;,sans-serif">13</span><span lang=3D"ZH-CN" style=3D"font-size:11.0pt=
; font-family:&quot;Calibri&quot;,sans-serif">=C8=D5</span><span style=3D"f=
ont-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif">
 5:12<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:11.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=CA=D5=BC=FE=C8=CB</span></b><b><span style=3D"f=
ont-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif">:</span></b><spa=
n style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif"> Wei=
qiang Cheng
 &lt;</span><a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_bla=
nk"><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-ser=
if">chengweiqiang@chinamobile.com</span></a><span style=3D"font-size:11.0pt=
; font-family:&quot;Arial&quot;,sans-serif">&gt;<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:11.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=B3=AD=CB=CD</span></b><b><span style=3D"font-si=
ze:11.0pt; font-family:&quot;Arial&quot;,sans-serif">:</span></b><span styl=
e=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif"> Tarek Saa=
d &lt;</span><a href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank"><span=
 style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif">tsaad=
.net@gmail.com</span></a><span style=3D"font-size:11.0pt; font-family:&quot=
;Arial&quot;,sans-serif">&gt;;
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:11.0pt; font-family:&quot;Arial=
&quot;,sans-serif">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</span>=
</a><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-ser=
if">;
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:11.0pt; font-family:&quot;Arial&quot;,sans-serif">mpls@ietf.org</sp=
an></a><span style=3D"font-size:11.0pt; font-family:&quot;Arial&quot;,sans-=
serif"><br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:11.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=D6=F7</span></b><b><span lang=3D"ZH-CN" style=
=3D"font-size:11.0pt; font-family:&quot;Microsoft JhengHei&quot;,sans-serif=
">=CC=E2</span></b><b><span style=3D"font-size:11.0pt; font-family:&quot;Ar=
ial&quot;,sans-serif">:</span></b><span style=3D"font-size:11.0pt; font-fam=
ily:&quot;Arial&quot;,sans-serif">
 Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</spa=
n><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Hi Authors,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">FYI:</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">The draft has some simil=
arity with the functionality defined in the following draft which is generi=
cally applicable to the all encap types:</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><a href=3D"https://nam03.safelinks.protec=
tion.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamtea=
m-ippm-ioam-direct-export-00&amp;data=3D02%7C01%7Chaoyu.song%40futurewei.co=
m%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1=
%7C0%7C637096654713533899&amp;sdata=3D8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbo=
zdAG6mH5Jo%3D&amp;reserved=3D0" originalsrc=3D"https://tools.ietf.org/html/=
draft-ioamteam-ippm-ioam-direct-export-00" shash=3D"r3aXXOspHGNqqd6n&#43;&#=
43;VvgtdNN6h&#43;isYAnMjNGC9XWI1bHqI&#43;e79WWTq7APllSJH4fEfmFAwuaefAQIOeEK=
hYmxWmSb8ivRocODSKe7vpinIprq24ic2dNp&#43;IruzVe8TRdy31PDgOwwwjr5ESORYqFWO1n=
AQRFUE&#43;NbQrF7Lyd2w=3D" target=3D"_blank"><span style=3D"">https://tools=
.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00</span></a><span st=
yle=3D""></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">You may want to have a l=
ook.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Thanks,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Rakesh</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">On Wed, Sep 25, 2019 at =
3:00 AM Weiqiang Cheng &lt;</span><a href=3D"mailto:chengweiqiang@chinamobi=
le.com" target=3D"_blank"><span style=3D"">chengweiqiang@chinamobile.com</s=
pan></a><span style=3D"">&gt; wrote:</span></p>
</div>
<blockquote style=3D"border:none; border-left:solid windowtext 1.0pt; paddi=
ng:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in=
; margin-bottom:5.0pt; border-color:currentcolor currentcolor currentcolor =
rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">Hi Tarek,</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">Thank you very much for your comments.</span><span style=3D""></span=
></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">We authors had some discussion on it and our feedback is in-line.</s=
pan><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">&nbsp;</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">B.R.</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">Weiqiang Cheng</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">&nbsp;</span><span style=3D""></span></p>
<div>
<div style=3D"border:none; border-top:solid windowtext 1.0pt; padding:3.0pt=
 0in 0in 0in; border-color:currentcolor">
<p class=3D"MsoNormal" style=3D""><b><span lang=3D"ZH-CN" style=3D"font-siz=
e:10.0pt; font-family:&quot;Microsoft JhengHei&quot;,sans-serif">=B7=A2=BC=
=FE=C8=CB</span></b><b><span style=3D"font-size:10.0pt">:</span></b><span s=
tyle=3D"font-size:10.0pt"> mpls [mailto:</span><a href=3D"mailto:mpls-bounc=
es@ietf.org" target=3D"_blank"><span style=3D"font-size:10.0pt">mpls-bounce=
s@ietf.org</span></a><span style=3D"font-size:10.0pt">]
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=B4=FA=B1=ED</span></b><b><span lang=3D"ZH-CN" s=
tyle=3D"font-size:10.0pt">
</span></b><span style=3D"font-size:10.0pt">Tarek Saad<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot=
;Microsoft JhengHei&quot;,sans-serif">=B7=A2=CB=CD=CA=B1=BC=E4</span></b><b=
><span style=3D"font-size:10.0pt">:</span></b><span style=3D"font-size:10.0=
pt"> 2019</span><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family=
:&quot;Calibri&quot;,sans-serif">=C4=EA</span><span style=3D"font-size:10.0=
pt">7</span><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&qu=
ot;Calibri&quot;,sans-serif">=D4=C2</span><span style=3D"font-size:10.0pt">=
22</span><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot;=
Calibri&quot;,sans-serif">=C8=D5</span><span style=3D"font-size:10.0pt">
 21:34<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=CA=D5=BC=FE=C8=CB</span></b><b><span style=3D"f=
ont-size:10.0pt">:</span></b><span style=3D"font-size:10.0pt">
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:10.0pt">draft-cheng-mpls-inband=
-pm-encapsulation@ietf.org</span></a><span style=3D"font-size:10.0pt"><br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=B3=AD=CB=CD</span></b><b><span style=3D"font-si=
ze:10.0pt">:</span></b><span style=3D"font-size:10.0pt">
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:10.0pt">mpls@ietf.org</span></a><span style=3D"font-size:10.0pt"><b=
r>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt; font-family:&quot=
;Calibri&quot;,sans-serif">=D6=F7</span></b><b><span lang=3D"ZH-CN" style=
=3D"font-size:10.0pt; font-family:&quot;Microsoft JhengHei&quot;,sans-serif=
">=CC=E2</span></b><b><span style=3D"font-size:10.0pt">:</span></b><span st=
yle=3D"font-size:10.0pt">
 [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</span><s=
pan style=3D""></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Hi authors,</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">From reading your draft,=
 have the following comments:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D""><span style=3D"">There=A1=AFs a similar =
proposal in draft-ietf-mpls-rfc6374-sfl that the WG has worked on to achiev=
e similar PM measurements. That proposal did not require a special label, n=
or requires carrying 2 new additional labels
 in label stack. Do you see any downside to the approach in draft-ietf-mpls=
-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted=
...</span></li></ul>
<p style=3D"margin-left:.5in"><span style=3D"">[Weiqiang] &nbsp; Yes, the S=
FL proposal was carefully considered before this draft was written, and the=
 major downsides of SFL include:</span></p>
<p style=3D"margin-left:.5in"><span style=3D"">1. It seems that the current=
 version of SFL targets at end-to-end performance measurement, &nbsp;but ou=
r draft targets at both end-to-end and hop-by-hop performance measurement. =
Of course, someone may argue that the SFL
 can be extended to support hop-by-hop performance measurement, but if that=
 happens, the SFL method is too complex for label management, because basic=
ally&nbsp;it assigns two implications to one mpls label.</span></p>
<p style=3D"margin-left:.5in"><span style=3D"">2. The SFL method can't be a=
pplied when we want to achieve performance measurements on both LSP and PW&=
nbsp;synchronously, but the method described in our draft can simply&nbsp;a=
chieve that.</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">&nbsp;</span><span style=3D""></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D""><span style=3D"">It appears that the lab=
el below the =A1=B0Flow Indicator Label=A1=B1 is used to carry/embed contex=
t information: including a flow identifier and additional flags - that are =
set by ingress. Normally, MPLS labels do not embed
 any context information about the flow they carry within them. The context=
 of the label is held by the node that allocates the label.</span></li></ul=
>
<p style=3D"margin-left:.5in"><span style=3D"">[Weiqiang] &nbsp; Your under=
standing is&nbsp;perfectly correct. And please also note that in our draft =
the Flow-ID label values are allocated by an external NMS or a controller, =
that means the context of the Flow-ID label is
 held by all the nodes within the administrative domain. Furthermore, I wan=
t to stress that the method described in our draft has already been impleme=
nted by more than two vendors, and we plan to deploy it in our&nbsp;commerc=
ial 5G backhaul networks.</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-size:10.5pt; color:#1=
F497D">&nbsp;</span><span style=3D""></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Regards,</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"">Tarek</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D""><span style=3D"">________________________=
_______________________<br>
mpls mailing list<br>
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mpls@ietf.org</span></a><span style=3D""><br>
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ps%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&amp;data=3D02%7C01%7Cha=
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t=3D"_blank"><span style=3D"">https://www.ietf.org/mailman/listinfo/mpls</s=
pan></a><span style=3D""></span></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Tue, 19 Nov 2019 07:52:52 +0800
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To: Haoyu Song <haoyu.song@futurewei.com>
Cc: Giuseppe Fioccola <giuseppe.fioccola@huawei.com>, Greg Mirsky <gregimirsky@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>,  "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Folks,
Many thanks for providing the detailed comparison information for the two
approaches. It would be good to capture them in the draft.

Thanks,
Rakesh


On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song <haoyu.song@futurewei.com> wrote=
:

> I agree the two techniques covers different use cases with different cost=
.
> Each has its own merits. Sometimes header overhead and data export
> bandwidth  are big concerns.  If AM is all user needs, there's  no point =
to
> use a more powerful yet more costly technique.
>
> Haoyu
>
>
>
> ------------------------------
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls <mpls-bounces@ietf.org> =E4=BB=A3=E8=
=A1=A8 Giuseppe Fioccola <
> giuseppe.fioccola@huawei.com>
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=E6=97=
=A5=E6=98=9F=E6=9C=9F=E4=B8=80 =E4=B8=8B=E5=8D=885:17
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Greg Mirsky; Rakesh Gandhi
> *=E6=8A=84=E9=80=81:* mpls@ietf.org; draft-cheng-mpls-inband-pm-encapsula=
tion@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
> Hi All,
>
> I agree with Greg. And there are at least 3 big differences between
> IOAM/IOAM-DEX and Alternate Marking:
>
> 1) IOAM/IOAM-DEX is a packet level monitoring while Alternate Marking is =
a
> flow monitoring solution
>
> 2) IOAM/IOAM-DEX introduces a new encapsulation while Alternate Marking
> can be encapsulated more easily and with less overhead (e.g. dedicated bi=
ts
> or TLV)
>
> 3) IOAM/IOAM-DEX architecture is more static (i.e. data specified by the
> IOAM-Trace-Type are exported by the nodes) while Alternate Marking includ=
es
> a dynamic approach and can be adapted to the network conditions (i.e.
> draft-ietf-ippm-multipoint-alt-mark)
>
>
>
> Best Regards,
>
>
>
> Giuseppe
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org] *On Behalf Of *Greg Mirsky
> *Sent:* Monday, November 18, 2019 8:07 AM
> *To:* Rakesh Gandhi <rgandhi.ietf@gmail.com>
> *Cc:* mpls@ietf.org; draft-cheng-mpls-inband-pm-encapsulation@ietf.org
> *Subject:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Rakesh, et al.,
>
> I don't consider AltMark/SFL as just a lighter version of DEX. One of the
> benefits of Alt.Marking, in my opinion, is that a node may be aggregating
> measurements, and export not the raw data, as with DEX, but calculated
> performance metrics.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi <rgandhi.ietf@gmail.com>
> wrote:
>
> Hi Tianran,
>
> Thanks for your reply. But this does not answer my question:)
>
> Question is why a light way is required when there is already direct
> export IOAM available.
>
>
>
> Regarding the SFL comment, when SFLs are used, we do not need L/D flags i=
n
> the header for coloring, as an SFL itself indicates the color.
>
>
>
> Thanks,
>
> Rakesh
>
>
>
>
>
> On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou <zhoutianran@huawei.com>
> wrote:
>
> Hi Rakesh,
>
>
>
> Thanks for your interest.
>
> I think the requirement of using alternate marking for mpls pm has alread=
y
> been acknowledged by this wg. As Tarek mentioned several times, the SFL i=
s
> produced for this usage.
>
> We bring a new encapsulation here to mitigate the deployment issue when w=
e
> try to apply the SFL.
>
> That=E2=80=99s our simple motivation.
>
>
>
> BR,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail=
.com]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=E6=97=
=A5 6:20
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Tianran Zhou <zhoutianran@huawei.com>
> *=E6=8A=84=E9=80=81:* Weiqiang Cheng <chengweiqiang@chinamobile.com>; Tar=
ek Saad <
> tsaad.net@gmail.com>; draft-cheng-mpls-inband-pm-encapsulation@ietf.org;
> mpls@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Tianran,
>
> Thanks for your reply.
>
> Right, IOAM Direct Export covers more than just PM. Both drafts would als=
o
> require special labels for the direct export for MPLS case. With this in
> mind, you may clarify in the draft why lite way is required for PM for MP=
LS
> case and how it is achieved with your draft compared to the IOAM direct
> export.
>
> Thanks,
>
> Rakesh
>
>
>
>
>
>
>
>
>
> On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou <zhoutianran@huawei.com>
> wrote:
>
> Hi Rakesh,
>
>
>
> As the coauthor of both drafts, I think they are different.
>
> This draft is only for performance measurement in a lite way.
>
> IOAM-DEX is to collect data based on the trace type instruction.
>
>
>
> Thanks,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Rakesh Gandhi [mailto:rgandhi.ietf@gmail=
.com]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:* 2019=E5=B9=B411=E6=9C=8813=E6=
=97=A5 5:12
> *=E6=94=B6=E4=BB=B6=E4=BA=BA**:* Weiqiang Cheng <chengweiqiang@chinamobil=
e.com>
> *=E6=8A=84=E9=80=81**:* Tarek Saad <tsaad.net@gmail.com>;
> draft-cheng-mpls-inband-pm-encapsulation@ietf.org; mpls@ietf.org
> *=E4=B8=BB**=E9=A2=98**:* Re: [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi Authors,
>
> FYI:
>
> The draft has some similarity with the functionality defined in the
> following draft which is generically applicable to the all encap types:
>
>
>
> https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
> <https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftool=
s.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&data=3D02%7C0=
1%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff=
2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=3D8%2FMYlbsByQ=
tiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%3D&reserved=3D0>
>
>
>
> You may want to have a look.
>
>
>
> Thanks,
>
> Rakesh
>
>
>
>
>
>
>
>
>
> On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng <
> chengweiqiang@chinamobile.com> wrote:
>
> Hi Tarek,
>
> Thank you very much for your comments.
>
> We authors had some discussion on it and our feedback is in-line.
>
>
>
> B.R.
>
> Weiqiang Cheng
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* mpls [mailto:mpls-bounces@ietf.org] *=E4=
=BB=A3=E8=A1=A8* Tarek Saad
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:* 2019=E5=B9=B47=E6=9C=8822=E6=97=
=A5 21:34
> *=E6=94=B6=E4=BB=B6=E4=BA=BA**:* draft-cheng-mpls-inband-pm-encapsulation=
@ietf.org
> *=E6=8A=84=E9=80=81**:* mpls@ietf.org
> *=E4=B8=BB**=E9=A2=98**:* [mpls] Comments on draft
> draft-cheng-mpls-inband-pm-encapsulation
>
>
>
> Hi authors,
>
>
>
> From reading your draft, have the following comments:
>
>    - There=E2=80=99s a similar proposal in draft-ietf-mpls-rfc6374-sfl th=
at the
>    WG has worked on to achieve similar PM measurements. That proposal did=
 not
>    require a special label, nor requires carrying 2 new additional labels=
 in
>    label stack. Do you see any downside to the approach in
>    draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can=
 this
>    be highlighted...
>
> [Weiqiang]   Yes, the SFL proposal was carefully considered before this
> draft was written, and the major downsides of SFL include:
>
> 1. It seems that the current version of SFL targets at end-to-end
> performance measurement,  but our draft targets at both end-to-end and
> hop-by-hop performance measurement. Of course, someone may argue that the
> SFL can be extended to support hop-by-hop performance measurement, but if
> that happens, the SFL method is too complex for label management, because
> basically it assigns two implications to one mpls label.
>
> 2. The SFL method can't be applied when we want to achieve performance
> measurements on both LSP and PW synchronously, but the method described i=
n
> our draft can simply achieve that.
>
>
>
>    - It appears that the label below the =E2=80=9CFlow Indicator Label=E2=
=80=9D is used
>    to carry/embed context information: including a flow identifier and
>    additional flags - that are set by ingress. Normally, MPLS labels do n=
ot
>    embed any context information about the flow they carry within them. T=
he
>    context of the label is held by the node that allocates the label.
>
> [Weiqiang]   Your understanding is perfectly correct. And please also not=
e
> that in our draft the Flow-ID label values are allocated by an external N=
MS
> or a controller, that means the context of the Flow-ID label is held by a=
ll
> the nodes within the administrative domain. Furthermore, I want to stress
> that the method described in our draft has already been implemented by mo=
re
> than two vendors, and we plan to deploy it in our commercial 5G backhaul
> networks.
>
>
>
>
>
> Regards,
>
> Tarek
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
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>
> _______________________________________________
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> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
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<div dir=3D"ltr"><div>Hi Folks,</div><div>Many thanks for providing the det=
ailed comparison information for the two approaches. It would be good to ca=
pture them in the draft. <br></div><div><br></div><div>Thanks,</div><div>Ra=
kesh</div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song &lt;<a =
href=3D"mailto:haoyu.song@futurewei.com">haoyu.song@futurewei.com</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div>
<div style=3D"color:rgb(33,33,33);background-color:rgb(255,255,255);text-al=
ign:left" dir=3D"auto">
I agree the two techniques covers different use cases with different cost. =
Each has its own merits. Sometimes header overhead and data export bandwidt=
h=C2=A0 are big concerns.=C2=A0 If AM is all user needs, there&#39;s=C2=A0 =
no point to use a more powerful yet more costly technique.=C2=A0</div>
<div style=3D"color:rgb(33,33,33);background-color:rgb(255,255,255);text-al=
ign:left" dir=3D"auto">
<br>
</div>
<div style=3D"color:rgb(33,33,33);background-color:rgb(255,255,255);text-al=
ign:left" dir=3D"auto">
Haoyu</div>
<div id=3D"gmail-m_-5517209361698451841ms-outlook-mobile-signature" dir=3D"=
auto" style=3D"text-align:left">
<div><br>
</div>
<br>
</div>
<div id=3D"gmail-m_-5517209361698451841id-d1cec3ef-1613-4025-8eb0-9d494f974=
d3d">
<div style=3D"font-family:sans-serif;font-size:12pt;color:rgb(0,0,0)"><br>
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"gmail-m_-5517209361698451841divRplyFwdMsg"><strong>=E5=8F=91=E4=
=BB=B6=E4=BA=BA:</strong> mpls &lt;<a href=3D"mailto:mpls-bounces@ietf.org"=
 target=3D"_blank">mpls-bounces@ietf.org</a>&gt; =E4=BB=A3=E8=A1=A8 Giusepp=
e Fioccola &lt;<a href=3D"mailto:giuseppe.fioccola@huawei.com" target=3D"_b=
lank">giuseppe.fioccola@huawei.com</a>&gt;<br>
<strong>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:</strong> 2019=E5=B9=B411=E6=
=9C=8818=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=80 =E4=B8=8B=E5=8D=885:17<br>
<strong>=E6=94=B6=E4=BB=B6=E4=BA=BA:</strong> Greg Mirsky; Rakesh Gandhi<br=
>
<strong>=E6=8A=84=E9=80=81:</strong> <a href=3D"mailto:mpls@ietf.org" targe=
t=3D"_blank">mpls@ietf.org</a>; <a href=3D"mailto:draft-cheng-mpls-inband-p=
m-encapsulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-enca=
psulation@ietf.org</a><br>
<strong>=E4=B8=BB=E9=A2=98:</strong> Re: [mpls] Comments on draft draft-che=
ng-mpls-inband-pm-encapsulation<br>
</div>
<br>



<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">Hi All,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">I agree with Greg. And there are=
 at least 3 big differences between IOAM/IOAM-DEX and Alternate Marking:</s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">1) IOAM/IOAM-DEX is a packet lev=
el monitoring while Alternate Marking is a flow monitoring solution</span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">2) IOAM/IOAM-DEX introduces a ne=
w encapsulation while Alternate Marking can be encapsulated more easily and=
 with less overhead (e.g. dedicated bits or TLV)</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">3) IOAM/IOAM-DEX architecture is=
 more static (i.e. data specified by the IOAM-Trace-Type are exported by th=
e nodes) while Alternate Marking includes a dynamic
 approach and can be adapted to the network conditions (i.e. draft-ietf-ipp=
m-multipoint-alt-mark)</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">Best Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:rgb(31,73,125)">Giuseppe</span></p>
<p class=3D"MsoNormal"><a name=3D"m_-5517209361698451841__MailEndCompose"><=
span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif;col=
or:rgb(31,73,125)">=C2=A0</span></a></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;C=
alibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"> mpls [mailto:<a href=3D"mailto:mpl=
s-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Greg Mirsky<br>
<b>Sent:</b> Monday, November 18, 2019 8:07 AM<br>
<b>To:</b> Rakesh Gandhi &lt;<a href=3D"mailto:rgandhi.ietf@gmail.com" targ=
et=3D"_blank">rgandhi.ietf@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a>; <a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" =
target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-enc=
apsulation</span></p>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<p class=3D"MsoNormal">Hi Rakesh, et al.,</p>
<div>
<p class=3D"MsoNormal">I don&#39;t consider AltMark/SFL as just a lighter v=
ersion of DEX. One of the benefits of Alt.Marking, in my opinion, is that a=
 node may be aggregating measurements, and export not the raw data, as with=
 DEX, but calculated performance metrics.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Regards,</p>
</div>
<div>
<p class=3D"MsoNormal">Greg</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi &lt;<a=
 href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"_blank">rgandhi.ietf@gmai=
l.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal">Hi Tianran,</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks for your reply. But this does not answer my q=
uestion:)</p>
</div>
<div>
<p class=3D"MsoNormal">Question is why a light way is required when there i=
s already direct export IOAM available.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Regarding the SFL comment, when SFLs are used, we do=
 not need L/D flags in the header for coloring, as an SFL itself indicates =
the color.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,</p>
</div>
<div>
<p class=3D"MsoNormal">Rakesh</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou &lt;<a =
href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei=
.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Hi Rakesh,</span><span></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Thanks for your interest.</spa=
n><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">I think the requirement of usi=
ng alternate marking for mpls pm has already been acknowledged by this wg. =
As Tarek mentioned several times, the SFL
 is produced for this usage.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">We bring a new encapsulation h=
ere to mitigate the deployment issue when we try to apply the SFL.</span><s=
pan></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">That=E2=80=99s our simple moti=
vation.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">BR,</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Tianran</span><span></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E4=BB=B6=E4=BA=BA=
</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Microsoft YaH=
ei&quot;,sans-serif">:</span></b><span style=3D"font-size:11pt;font-family:=
&quot;Microsoft YaHei&quot;,sans-serif">
 Rakesh Gandhi [mailto:</span><a href=3D"mailto:rgandhi.ietf@gmail.com" tar=
get=3D"_blank"><span style=3D"font-size:11pt;font-family:&quot;Microsoft Ya=
Hei&quot;,sans-serif">rgandhi.ietf@gmail.com</span></a><span style=3D"font-=
size:11pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif">]
<br>
<b><span lang=3D"ZH-CN">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span>:</b> 20=
19<span lang=3D"ZH-CN">=E5=B9=B4</span>11<span lang=3D"ZH-CN">=E6=9C=88</sp=
an>18<span lang=3D"ZH-CN">=E6=97=A5</span> 6:20<br>
<b><span lang=3D"ZH-CN">=E6=94=B6=E4=BB=B6=E4=BA=BA</span>:</b> Tianran Zho=
u &lt;</span><a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank"><s=
pan style=3D"font-size:11pt;font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">zhoutianran@huawei.com</span></a><span style=3D"font-size:11pt;font-fa=
mily:&quot;Microsoft YaHei&quot;,sans-serif">&gt;<br>
<b><span lang=3D"ZH-CN">=E6=8A=84=E9=80=81</span>:</b> Weiqiang Cheng &lt;<=
/span><a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank"><s=
pan style=3D"font-size:11pt;font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">chengweiqiang@chinamobile.com</span></a><span style=3D"font-size:11pt;=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">&gt;;
 Tarek Saad &lt;</span><a href=3D"mailto:tsaad.net@gmail.com" target=3D"_bl=
ank"><span style=3D"font-size:11pt;font-family:&quot;Microsoft YaHei&quot;,=
sans-serif">tsaad.net@gmail.com</span></a><span style=3D"font-size:11pt;fon=
t-family:&quot;Microsoft YaHei&quot;,sans-serif">&gt;;
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:11pt;font-family:&quot;Microsof=
t YaHei&quot;,sans-serif">draft-cheng-mpls-inband-pm-encapsulation@ietf.org=
</span></a><span style=3D"font-size:11pt;font-family:&quot;Microsoft YaHei&=
quot;,sans-serif">;
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:11pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif">mpls@ietf.=
org</span></a><span style=3D"font-size:11pt;font-family:&quot;Microsoft YaH=
ei&quot;,sans-serif"><br>
<b><span lang=3D"ZH-CN">=E4=B8=BB=E9=A2=98</span>:</b> Re: [mpls] Comments =
on draft draft-cheng-mpls-inband-pm-encapsulation</span><span></span></p>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>Hi Tianran,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Thanks for your reply.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Right, IOAM Direct Export covers more than jus=
t PM. Both drafts would also require special labels for the direct export f=
or MPLS case. With this in mind, you may clarify in the draft why lite way =
is required for
 PM for MPLS case and how it is achieved with your draft compared to the IO=
AM direct export.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Thanks,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Rakesh</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou =
&lt;</span><a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank"><spa=
n>zhoutianran@huawei.com</span></a><span>&gt; wrote:</span></p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Hi Rakesh,</span><span></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">As the coauthor of both drafts=
, I think they are different.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">This draft is only for perform=
ance measurement in a lite way.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">IOAM-DEX is to collect data ba=
sed on the trace type instruction.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Thanks,</span><span></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Tianran</span><span></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;M=
icrosoft JhengHei&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E4=BB=B6=E4=BA=
=BA</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Arial&quot=
;,sans-serif">:</span></b><span style=3D"font-size:11pt;font-family:&quot;A=
rial&quot;,sans-serif">
 Rakesh Gandhi [mailto:</span><a href=3D"mailto:rgandhi.ietf@gmail.com" tar=
get=3D"_blank"><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,=
sans-serif">rgandhi.ietf@gmail.com</span></a><span style=3D"font-size:11pt;=
font-family:&quot;Arial&quot;,sans-serif">]
<br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;Microsoft JhengHe=
i&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</sp=
an></b><b><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-=
serif">:</span></b><span style=3D"font-size:11pt;font-family:&quot;Arial&qu=
ot;,sans-serif"> 2019</span><span style=3D"font-size:11pt;font-family:&quot=
;Calibri&quot;,sans-serif" lang=3D"ZH-CN">=E5=B9=B4</span><span style=3D"fo=
nt-size:11pt;font-family:&quot;Arial&quot;,sans-serif">11</span><span style=
=3D"font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif" lang=3D"ZH-C=
N">=E6=9C=88</span><span style=3D"font-size:11pt;font-family:&quot;Arial&qu=
ot;,sans-serif">13</span><span style=3D"font-size:11pt;font-family:&quot;Ca=
libri&quot;,sans-serif" lang=3D"ZH-CN">=E6=97=A5</span><span style=3D"font-=
size:11pt;font-family:&quot;Arial&quot;,sans-serif">
 5:12<br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E6=94=B6=E4=BB=B6=E4=BA=BA</span></b><b><span styl=
e=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif">:</span></b><=
span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif"> Wei=
qiang Cheng
 &lt;</span><a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_bla=
nk"><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif"=
>chengweiqiang@chinamobile.com</span></a><span style=3D"font-size:11pt;font=
-family:&quot;Arial&quot;,sans-serif">&gt;<br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E6=8A=84=E9=80=81</span></b><b><span style=3D"font=
-size:11pt;font-family:&quot;Arial&quot;,sans-serif">:</span></b><span styl=
e=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif"> Tarek Saad &=
lt;</span><a href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank"><span st=
yle=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif">tsaad.net@g=
mail.com</span></a><span style=3D"font-size:11pt;font-family:&quot;Arial&qu=
ot;,sans-serif">&gt;;
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:11pt;font-family:&quot;Arial&qu=
ot;,sans-serif">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</span></a=
><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif">;
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:11pt;font-family:&quot;Arial&quot;,sans-serif">mpls@ietf.org</span>=
</a><span style=3D"font-size:11pt;font-family:&quot;Arial&quot;,sans-serif"=
><br>
</span><b><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E4=B8=BB</span></b><b><span style=3D"font-size:11p=
t;font-family:&quot;Microsoft JhengHei&quot;,sans-serif" lang=3D"ZH-CN">=E9=
=A2=98</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Arial&q=
uot;,sans-serif">:</span></b><span style=3D"font-size:11pt;font-family:&quo=
t;Arial&quot;,sans-serif">
 Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</spa=
n><span></span></p>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>Hi Authors,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>FYI:</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>The draft has some similarity with the functio=
nality defined in the following draft which is generically applicable to th=
e all encap types:</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"https://nam03.safelinks.protection.outloo=
k.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam=
-direct-export-00&amp;data=3D02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc3=
6bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C6370=
96654713533899&amp;sdata=3D8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%=
3D&amp;reserved=3D0" target=3D"_blank"><span>https://tools.ietf.org/html/dr=
aft-ioamteam-ippm-ioam-direct-export-00</span></a><span></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>You may want to have a look.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Thanks,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Rakesh</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng=
 &lt;</span><a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_bla=
nk"><span>chengweiqiang@chinamobile.com</span></a><span>&gt; wrote:</span><=
/p>
</div>
<blockquote style=3D"border-style:none none none solid;border-width:medium =
medium medium 1pt;padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt;border-c=
olor:currentcolor currentcolor currentcolor rgb(204,204,204)">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">Hi Tarek,</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">Thank you very much for your comments.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">We authors had some discussion on it and our feedback is in-line.</span><=
span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">B.R.</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">Weiqiang Cheng</span><span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">=C2=A0</span><span></span></p>
<div>
<div style=3D"border-style:solid none none;border-width:1pt medium medium;p=
adding:3pt 0in 0in;border-color:currentcolor">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10pt;font-family:&quot;M=
icrosoft JhengHei&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E4=BB=B6=E4=BA=
=BA</span></b><b><span style=3D"font-size:10pt">:</span></b><span style=3D"=
font-size:10pt"> mpls [mailto:</span><a href=3D"mailto:mpls-bounces@ietf.or=
g" target=3D"_blank"><span style=3D"font-size:10pt">mpls-bounces@ietf.org</=
span></a><span style=3D"font-size:10pt">]
</span><b><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E4=BB=A3=E8=A1=A8</span></b><b><span style=3D"font=
-size:10pt" lang=3D"ZH-CN">
</span></b><span style=3D"font-size:10pt">Tarek Saad<br>
</span><b><span style=3D"font-size:10pt;font-family:&quot;Microsoft JhengHe=
i&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</sp=
an></b><b><span style=3D"font-size:10pt">:</span></b><span style=3D"font-si=
ze:10pt"> 2019</span><span style=3D"font-size:10pt;font-family:&quot;Calibr=
i&quot;,sans-serif" lang=3D"ZH-CN">=E5=B9=B4</span><span style=3D"font-size=
:10pt">7</span><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot=
;,sans-serif" lang=3D"ZH-CN">=E6=9C=88</span><span style=3D"font-size:10pt"=
>22</span><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E6=97=A5</span><span style=3D"font-size:10pt">
 21:34<br>
</span><b><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E6=94=B6=E4=BB=B6=E4=BA=BA</span></b><b><span styl=
e=3D"font-size:10pt">:</span></b><span style=3D"font-size:10pt">
</span><a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org"=
 target=3D"_blank"><span style=3D"font-size:10pt">draft-cheng-mpls-inband-p=
m-encapsulation@ietf.org</span></a><span style=3D"font-size:10pt"><br>
</span><b><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E6=8A=84=E9=80=81</span></b><b><span style=3D"font=
-size:10pt">:</span></b><span style=3D"font-size:10pt">
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"fo=
nt-size:10pt">mpls@ietf.org</span></a><span style=3D"font-size:10pt"><br>
</span><b><span style=3D"font-size:10pt;font-family:&quot;Calibri&quot;,san=
s-serif" lang=3D"ZH-CN">=E4=B8=BB</span></b><b><span style=3D"font-size:10p=
t;font-family:&quot;Microsoft JhengHei&quot;,sans-serif" lang=3D"ZH-CN">=E9=
=A2=98</span></b><b><span style=3D"font-size:10pt">:</span></b><span style=
=3D"font-size:10pt">
 [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation</span><s=
pan></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<p class=3D"MsoNormal"><span>Hi authors,</span></p>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<p class=3D"MsoNormal"><span>From reading your draft, have the following co=
mments:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"><span>There=E2=80=99s a similar proposal in draft-i=
etf-mpls-rfc6374-sfl that the WG has worked on to achieve similar PM measur=
ements. That proposal did not require a special label, nor requires carryin=
g 2 new additional labels
 in label stack. Do you see any downside to the approach in draft-ietf-mpls=
-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted=
...</span></li></ul>
<p style=3D"margin-left:0.5in"><span>[Weiqiang] =C2=A0 Yes, the SFL proposa=
l was carefully considered before this draft was written, and the major dow=
nsides of SFL include:</span></p>
<p style=3D"margin-left:0.5in"><span>1. It seems that the current version o=
f SFL targets at end-to-end performance measurement, =C2=A0but our draft ta=
rgets at both end-to-end and hop-by-hop performance measurement. Of course,=
 someone may argue that the SFL
 can be extended to support hop-by-hop performance measurement, but if that=
 happens, the SFL method is too complex for label management, because basic=
ally=C2=A0it assigns two implications to one mpls label.</span></p>
<p style=3D"margin-left:0.5in"><span>2. The SFL method can&#39;t be applied=
 when we want to achieve performance measurements on both LSP and PW=C2=A0s=
ynchronously, but the method described in our draft can simply=C2=A0achieve=
 that.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">=C2=A0</span><span></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"><span>It appears that the label below the =E2=80=9C=
Flow Indicator Label=E2=80=9D is used to carry/embed context information: i=
ncluding a flow identifier and additional flags - that are set by ingress. =
Normally, MPLS labels do not embed
 any context information about the flow they carry within them. The context=
 of the label is held by the node that allocates the label.</span></li></ul=
>
<p style=3D"margin-left:0.5in"><span>[Weiqiang] =C2=A0 Your understanding i=
s=C2=A0perfectly correct. And please also note that in our draft the Flow-I=
D label values are allocated by an external NMS or a controller, that means=
 the context of the Flow-ID label is
 held by all the nodes within the administrative domain. Furthermore, I wan=
t to stress that the method described in our draft has already been impleme=
nted by more than two vendors, and we plan to deploy it in our=C2=A0commerc=
ial 5G backhaul networks.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:rgb(31,73,125)=
">=C2=A0</span><span></span></p>
<p class=3D"MsoNormal"><span>=C2=A0</span></p>
<p class=3D"MsoNormal"><span>Regards,</span></p>
<p class=3D"MsoNormal"><span>Tarek</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>______________________________________________=
_<br>
mpls mailing list<br>
</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span>mpls@ietf.o=
rg</span></a><span><br>
</span><a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhtt=
ps%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&amp;data=3D02%7C01%7Cha=
oyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b24=
0189c753a1d5591fedc%7C1%7C0%7C637096654713533899&amp;sdata=3DeLlJd2dsRk5jZy=
OGbwGCGt6HushkmcjiEiGo3alzvOA%3D&amp;reserved=3D0" target=3D"_blank"><span>=
https://www.ietf.org/mailman/listinfo/mpls</span></a><span></span></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&amp;data=3D02%7C01%7Chaoyu.son=
g%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c75=
3a1d5591fedc%7C1%7C0%7C637096654713543892&amp;sdata=3DHeBC5bx%2F8nbA0wOPIXZ=
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ww.ietf.org/mailman/listinfo/mpls</a></p>
</blockquote>
</div>
</div>
<br>
</div>
</div>

</blockquote></div>

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To: Rakesh Gandhi <rgandhi.ietf@gmail.com>, Haoyu Song <haoyu.song@futurewei.com>
Cc: "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Rakesh,

Good idea, would be enough if we captured this in the MPLS document, or
should it be in the IPPM draft also?

/Loa

PS
I added the IPPM chairs to this thread.

On 19/11/2019 07:52, Rakesh Gandhi wrote:
> Hi Folks,
> Many thanks for providing the detailed comparison information for the 
> two approaches. It would be good to capture them in the draft.
> 
> Thanks,
> Rakesh
> 
> 
> On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song <haoyu.song@futurewei.com 
> <mailto:haoyu.song@futurewei.com>> wrote:
> 
>     I agree the two techniques covers different use cases with different
>     cost. Each has its own merits. Sometimes header overhead and data
>     export bandwidth  are big concerns.  If AM is all user needs,
>     there's  no point to use a more powerful yet more costly technique.
> 
>     Haoyu
> 
> 
> 
>     ------------------------------------------------------------------------
>     *发件人:* mpls <mpls-bounces@ietf.org <mailto:mpls-
>     bounces@ietf.org>> 代表 Giuseppe Fioccola
>     <giuseppe.fioccola@huawei.com <mailto:giuseppe.fioccola@huawei.com>>
>     *发送时间:* 2019年11月18日星期一 下午5:17
>     *收件人:* Greg Mirsky; Rakesh Gandhi
>     *抄送:* mpls@ietf.org <mailto:mpls@ietf.org>;
>     draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>     *主题:* Re: [mpls] Comments on draft
>     draft-cheng-mpls-inband-pm-encapsulation
> 
>     Hi All,
> 
>     I agree with Greg. And there are at least 3 big differences between
>     IOAM/IOAM-DEX and Alternate Marking:
> 
>     1) IOAM/IOAM-DEX is a packet level monitoring while Alternate
>     Marking is a flow monitoring solution
> 
>     2) IOAM/IOAM-DEX introduces a new encapsulation while Alternate
>     Marking can be encapsulated more easily and with less overhead (e.g.
>     dedicated bits or TLV)
> 
>     3) IOAM/IOAM-DEX architecture is more static (i.e. data specified by
>     the IOAM-Trace-Type are exported by the nodes) while Alternate
>     Marking includes a dynamic approach and can be adapted to the
>     network conditions (i.e. draft-ietf-ippm-multipoint-alt-mark)
> 
>     Best Regards,
> 
>     Giuseppe
> 
>     *From:*mpls [mailto:mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org>] *On Behalf Of *Greg Mirsky
>     *Sent:* Monday, November 18, 2019 8:07 AM
>     *To:* Rakesh Gandhi <rgandhi.ietf@gmail.com
>     <mailto:rgandhi.ietf@gmail.com>>
>     *Cc:* mpls@ietf.org <mailto:mpls@ietf.org>;
>     draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>     *Subject:* Re: [mpls] Comments on draft
>     draft-cheng-mpls-inband-pm-encapsulation
> 
>     Hi Rakesh, et al.,
> 
>     I don't consider AltMark/SFL as just a lighter version of DEX. One
>     of the benefits of Alt.Marking, in my opinion, is that a node may be
>     aggregating measurements, and export not the raw data, as with DEX,
>     but calculated performance metrics.
> 
>     Regards,
> 
>     Greg
> 
>     On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi
>     <rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>> wrote:
> 
>         Hi Tianran,
> 
>         Thanks for your reply. But this does not answer my question:)
> 
>         Question is why a light way is required when there is already
>         direct export IOAM available.
> 
>         Regarding the SFL comment, when SFLs are used, we do not need
>         L/D flags in the header for coloring, as an SFL itself indicates
>         the color.
> 
>         Thanks,
> 
>         Rakesh
> 
>         On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou
>         <zhoutianran@huawei..com <mailto:zhoutianran@huawei.com>> wrote:
> 
>             Hi Rakesh,
> 
>             Thanks for your interest.
> 
>             I think the requirement of using alternate marking for mpls
>             pm has already been acknowledged by this wg. As Tarek
>             mentioned several times, the SFL is produced for this usage.
> 
>             We bring a new encapsulation here to mitigate the deployment
>             issue when we try to apply the SFL.
> 
>             That’s our simple motivation.
> 
>             BR,
> 
>             Tianran
> 
>             *发件人**:*Rakesh Gandhi [mailto:rgandhi.ietf@gmail.com
>             <mailto:rgandhi.ietf@gmail.com>]
>             *发送时间:* 2019年11月18日 6:20
>             *收件人:* Tianran Zhou <zhoutianran@huawei.com
>             <mailto:zhoutianran@huawei.com>>
>             *抄送:* Weiqiang Cheng <chengweiqiang@chinamobile.com
>             <mailto:chengweiqiang@chinamobile.com>>; Tarek Saad
>             <tsaad.net@gmail.com <mailto:tsaad.net@gmail.com>>;
>             draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>             <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>;
>             mpls@ietf.org <mailto:mpls@ietf.org>
>             *主题:* Re: [mpls] Comments on draft
>             draft-cheng-mpls-inband-pm-encapsulation
> 
>             Hi Tianran,
> 
>             Thanks for your reply.
> 
>             Right, IOAM Direct Export covers more than just PM. Both
>             drafts would also require special labels for the direct
>             export for MPLS case. With this in mind, you may clarify in
>             the draft why lite way is required for PM for MPLS case and
>             how it is achieved with your draft compared to the IOAM
>             direct export.
> 
>             Thanks,
> 
>             Rakesh
> 
>             On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou
>             <zhoutianran@huawei.com <mailto:zhoutianran@huawei.com>> wrote:
> 
>                 Hi Rakesh,
> 
>                 As the coauthor of both drafts, I think they are different.
> 
>                 This draft is only for performance measurement in a lite
>                 way.
> 
>                 IOAM-DEX is to collect data based on the trace type
>                 instruction.
> 
>                 Thanks,
> 
>                 Tianran
> 
>                 *发件人**:*Rakesh Gandhi [mailto:rgandhi.ietf@gmail.com
>                 <mailto:rgandhi.ietf@gmail.com>]
>                 *发送时间**:*2019年11月13日5:12
>                 *收件人**:*Weiqiang Cheng <chengweiqiang@chinamobile.com
>                 <mailto:chengweiqiang@chinamobile.com>>
>                 *抄送**:*Tarek Saad <tsaad.net@gmail.com
>                 <mailto:tsaad.net@gmail.com>>;
>                 draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>                 <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>;
>                 mpls@ietf.org <mailto:mpls@ietf.org>
>                 *主**题**:*Re: [mpls] Comments on draft
>                 draft-cheng-mpls-inband-pm-encapsulation
> 
>                 Hi Authors,
> 
>                 FYI:
> 
>                 The draft has some similarity with the functionality
>                 defined in the following draft which is generically
>                 applicable to the all encap types:
> 
>                 https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
>                 <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%3D&reserved=0>
> 
>                 You may want to have a look.
> 
>                 Thanks,
> 
>                 Rakesh
> 
>                 On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng
>                 <chengweiqiang@chinamobile.com
>                 <mailto:chengweiqiang@chinamobile.com>> wrote:
> 
>                     Hi Tarek,
> 
>                     Thank you very much for your comments.
> 
>                     We authors had some discussion on it and our
>                     feedback is in-line.
> 
>                     B.R.
> 
>                     Weiqiang Cheng
> 
>                     *发件人**:*mpls [mailto:mpls-bounces@ietf.org
>                     <mailto:mpls-bounces@ietf.org>] *代表***Tarek Saad
>                     *发送时间**:*2019年7月22日21:34
>                     *收件人**:*draft-cheng-mpls-inband-pm-
>                     encapsulation@ietf.org
>                     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>                     *抄送**:*mpls@ietf.org <mailto:mpls@ietf.org>
>                     *主**题**:*[mpls] Comments on draft
>                     draft-cheng-mpls-inband-pm-encapsulation
> 
>                     Hi authors,
> 
>                      From reading your draft, have the following comments:
> 
>                       * There’s a similar proposal in
>                         draft-ietf-mpls-rfc6374-sfl that the WG has
>                         worked on to achieve similar PM measurements.
>                         That proposal did not require a special label,
>                         nor requires carrying 2 new additional labels in
>                         label stack. Do you see any downside to the
>                         approach in draft-ietf-mpls-rfc6374-sfl vs. the
>                         new one introduced one? If so, can this be
>                         highlighted....
> 
>                     [Weiqiang]   Yes, the SFL proposal was carefully
>                     considered before this draft was written, and the
>                     major downsides of SFL include:
> 
>                     1. It seems that the current version of SFL targets
>                     at end-to-end performance measurement,  but our
>                     draft targets at both end-to-end and hop-by-hop
>                     performance measurement. Of course, someone may
>                     argue that the SFL can be extended to support
>                     hop-by-hop performance measurement, but if that
>                     happens, the SFL method is too complex for label
>                     management, because basically it assigns two
>                     implications to one mpls label.
> 
>                     2. The SFL method can't be applied when we want to
>                     achieve performance measurements on both LSP and
>                     PW synchronously, but the method described in our
>                     draft can simply achieve that.
> 
>                       * It appears that the label below the “Flow
>                         Indicator Label” is used to carry/embed context
>                         information: including a flow identifier and
>                         additional flags - that are set by ingress.
>                         Normally, MPLS labels do not embed any context
>                         information about the flow they carry within
>                         them. The context of the label is held by the
>                         node that allocates the label.
> 
>                     [Weiqiang]   Your understanding is perfectly
>                     correct. And please also note that in our draft the
>                     Flow-ID label values are allocated by an external
>                     NMS or a controller, that means the context of the
>                     Flow-ID label is held by all the nodes within the
>                     administrative domain. Furthermore, I want to stress
>                     that the method described in our draft has already
>                     been implemented by more than two vendors, and we
>                     plan to deploy it in our commercial 5G backhaul
>                     networks.
> 
>                     Regards,
> 
>                     Tarek
> 
>                     _______________________________________________
>                     mpls mailing list
>                     mpls@ietf.org <mailto:mpls@ietf.org>
>                     https://www.ietf.org/mailman/listinfo/mpls
>                     <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=eLlJd2dsRk5jZyOGbwGCGt6HushkmcjiEiGo3alzvOA%3D&reserved=0>
> 
>         _______________________________________________
>         mpls mailing list
>         mpls@ietf.org <mailto:mpls@ietf.org>
>         https://www.ietf.org/mailman/listinfo/mpls
>         <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713543892&sdata=HeBC5bx%2F8nbA0wOPIXZiQNQz8JVGTE%2Fn4DAlpE6uVhY%3D&reserved=0>
> 
> 
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 19 Nov 2019 12:47:18 +0800
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To: Loa Andersson <loa@pi.nu>
Cc: Rakesh Gandhi <rgandhi.ietf@gmail.com>, Haoyu Song <haoyu.song@futurewei.com>,  "mpls@ietf.org" <mpls@ietf.org>, "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Hi Loa,
I think that the IPPM document already exists - it is RFC 8321. Also, there
are a number of drafts, e.g., in BIER, SFC, and NVO3 WGs, that describe how
the Alternate Marking method can be applied to the particular network.

Regards,
Greg

Regards,
Greg

On Tue, Nov 19, 2019 at 9:03 AM Loa Andersson <loa@pi.nu> wrote:

> Rakesh,
>
> Good idea, would be enough if we captured this in the MPLS document, or
> should it be in the IPPM draft also?
>
> /Loa
>
> PS
> I added the IPPM chairs to this thread.
>
> On 19/11/2019 07:52, Rakesh Gandhi wrote:
> > Hi Folks,
> > Many thanks for providing the detailed comparison information for the
> > two approaches. It would be good to capture them in the draft.
> >
> > Thanks,
> > Rakesh
> >
> >
> > On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song <haoyu.song@futurewei.com
> > <mailto:haoyu.song@futurewei.com>> wrote:
> >
> >     I agree the two techniques covers different use cases with differen=
t
> >     cost. Each has its own merits. Sometimes header overhead and data
> >     export bandwidth  are big concerns.  If AM is all user needs,
> >     there's  no point to use a more powerful yet more costly technique.
> >
> >     Haoyu
> >
> >
> >
> >
>  ------------------------------------------------------------------------
> >     *=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls <mpls-bounces@ietf.org <mailto:=
mpls-
> >     bounces@ietf.org>> =E4=BB=A3=E8=A1=A8 Giuseppe Fioccola
> >     <giuseppe.fioccola@huawei.com <mailto:giuseppe.fioccola@huawei.com>=
>
> >     *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=
=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=80 =E4=B8=8B=E5=8D=885:17
> >     *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Greg Mirsky; Rakesh Gandhi
> >     *=E6=8A=84=E9=80=81:* mpls@ietf.org <mailto:mpls@ietf.org>;
> >     draft-cheng-mpls-inband-pm-encapsulation@ietf.org
> >     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
> >     *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> >     draft-cheng-mpls-inband-pm-encapsulation
> >
> >     Hi All,
> >
> >     I agree with Greg. And there are at least 3 big differences between
> >     IOAM/IOAM-DEX and Alternate Marking:
> >
> >     1) IOAM/IOAM-DEX is a packet level monitoring while Alternate
> >     Marking is a flow monitoring solution
> >
> >     2) IOAM/IOAM-DEX introduces a new encapsulation while Alternate
> >     Marking can be encapsulated more easily and with less overhead (e.g=
.
> >     dedicated bits or TLV)
> >
> >     3) IOAM/IOAM-DEX architecture is more static (i.e. data specified b=
y
> >     the IOAM-Trace-Type are exported by the nodes) while Alternate
> >     Marking includes a dynamic approach and can be adapted to the
> >     network conditions (i.e. draft-ietf-ippm-multipoint-alt-mark)
> >
> >     Best Regards,
> >
> >     Giuseppe
> >
> >     *From:*mpls [mailto:mpls-bounces@ietf.org
> >     <mailto:mpls-bounces@ietf.org>] *On Behalf Of *Greg Mirsky
> >     *Sent:* Monday, November 18, 2019 8:07 AM
> >     *To:* Rakesh Gandhi <rgandhi.ietf@gmail.com
> >     <mailto:rgandhi.ietf@gmail.com>>
> >     *Cc:* mpls@ietf.org <mailto:mpls@ietf.org>;
> >     draft-cheng-mpls-inband-pm-encapsulation@ietf.org
> >     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
> >     *Subject:* Re: [mpls] Comments on draft
> >     draft-cheng-mpls-inband-pm-encapsulation
> >
> >     Hi Rakesh, et al.,
> >
> >     I don't consider AltMark/SFL as just a lighter version of DEX. One
> >     of the benefits of Alt.Marking, in my opinion, is that a node may b=
e
> >     aggregating measurements, and export not the raw data, as with DEX,
> >     but calculated performance metrics.
> >
> >     Regards,
> >
> >     Greg
> >
> >     On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi
> >     <rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>> wrote:
> >
> >         Hi Tianran,
> >
> >         Thanks for your reply. But this does not answer my question:)
> >
> >         Question is why a light way is required when there is already
> >         direct export IOAM available.
> >
> >         Regarding the SFL comment, when SFLs are used, we do not need
> >         L/D flags in the header for coloring, as an SFL itself indicate=
s
> >         the color.
> >
> >         Thanks,
> >
> >         Rakesh
> >
> >         On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou
> >         <zhoutianran@huawei..com <mailto:zhoutianran@huawei.com>> wrote=
:
> >
> >             Hi Rakesh,
> >
> >             Thanks for your interest.
> >
> >             I think the requirement of using alternate marking for mpls
> >             pm has already been acknowledged by this wg. As Tarek
> >             mentioned several times, the SFL is produced for this usage=
.
> >
> >             We bring a new encapsulation here to mitigate the deploymen=
t
> >             issue when we try to apply the SFL.
> >
> >             That=E2=80=99s our simple motivation.
> >
> >             BR,
> >
> >             Tianran
> >
> >             *=E5=8F=91=E4=BB=B6=E4=BA=BA**:*Rakesh Gandhi [mailto:rgand=
hi.ietf@gmail.com
> >             <mailto:rgandhi.ietf@gmail.com>]
> >             *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=
=9C=8818=E6=97=A5 6:20
> >             *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Tianran Zhou <zhoutianran@hu=
awei.com
> >             <mailto:zhoutianran@huawei.com>>
> >             *=E6=8A=84=E9=80=81:* Weiqiang Cheng <chengweiqiang@chinamo=
bile.com
> >             <mailto:chengweiqiang@chinamobile.com>>; Tarek Saad
> >             <tsaad.net@gmail.com <mailto:tsaad.net@gmail.com>>;
> >             draft-cheng-mpls-inband-pm-encapsulation@ietf.org
> >             <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>;
> >             mpls@ietf.org <mailto:mpls@ietf.org>
> >             *=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft
> >             draft-cheng-mpls-inband-pm-encapsulation
> >
> >             Hi Tianran,
> >
> >             Thanks for your reply.
> >
> >             Right, IOAM Direct Export covers more than just PM. Both
> >             drafts would also require special labels for the direct
> >             export for MPLS case. With this in mind, you may clarify in
> >             the draft why lite way is required for PM for MPLS case and
> >             how it is achieved with your draft compared to the IOAM
> >             direct export.
> >
> >             Thanks,
> >
> >             Rakesh
> >
> >             On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou
> >             <zhoutianran@huawei.com <mailto:zhoutianran@huawei.com>>
> wrote:
> >
> >                 Hi Rakesh,
> >
> >                 As the coauthor of both drafts, I think they are
> different.
> >
> >                 This draft is only for performance measurement in a lit=
e
> >                 way.
> >
> >                 IOAM-DEX is to collect data based on the trace type
> >                 instruction.
> >
> >                 Thanks,
> >
> >                 Tianran
> >
> >                 *=E5=8F=91=E4=BB=B6=E4=BA=BA**:*Rakesh Gandhi [mailto:r=
gandhi.ietf@gmail.com
> >                 <mailto:rgandhi.ietf@gmail.com>]
> >                 *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:*2019=E5=B9=B41=
1=E6=9C=8813=E6=97=A55:12
> >                 *=E6=94=B6=E4=BB=B6=E4=BA=BA**:*Weiqiang Cheng <chengwe=
iqiang@chinamobile.com
> >                 <mailto:chengweiqiang@chinamobile.com>>
> >                 *=E6=8A=84=E9=80=81**:*Tarek Saad <tsaad.net@gmail.com
> >                 <mailto:tsaad.net@gmail.com>>;
> >                 draft-cheng-mpls-inband-pm-encapsulation@ietf.org
> >                 <mailto:
> draft-cheng-mpls-inband-pm-encapsulation@ietf.org>;
> >                 mpls@ietf.org <mailto:mpls@ietf.org>
> >                 *=E4=B8=BB**=E9=A2=98**:*Re: [mpls] Comments on draft
> >                 draft-cheng-mpls-inband-pm-encapsulation
> >
> >                 Hi Authors,
> >
> >                 FYI:
> >
> >                 The draft has some similarity with the functionality
> >                 defined in the following draft which is generically
> >                 applicable to the all encap types:
> >
> >
> https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
> >                 <
> https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools=
.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&data=3D02%7C01=
%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2=
a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=3D8%2FMYlbsByQt=
iewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%3D&reserved=3D0
> >
> >
> >                 You may want to have a look.
> >
> >                 Thanks,
> >
> >                 Rakesh
> >
> >                 On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng
> >                 <chengweiqiang@chinamobile.com
> >                 <mailto:chengweiqiang@chinamobile.com>> wrote:
> >
> >                     Hi Tarek,
> >
> >                     Thank you very much for your comments.
> >
> >                     We authors had some discussion on it and our
> >                     feedback is in-line.
> >
> >                     B.R.
> >
> >                     Weiqiang Cheng
> >
> >                     *=E5=8F=91=E4=BB=B6=E4=BA=BA**:*mpls [mailto:mpls-b=
ounces@ietf.org
> >                     <mailto:mpls-bounces@ietf.org>] *=E4=BB=A3=E8=A1=A8=
***Tarek Saad
> >                     *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:*2019=E5=B9=
=B47=E6=9C=8822=E6=97=A521:34
> >                     *=E6=94=B6=E4=BB=B6=E4=BA=BA**:*draft-cheng-mpls-in=
band-pm-
> >                     encapsulation@ietf.org
> >                     <mailto:
> draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
> >                     *=E6=8A=84=E9=80=81**:*mpls@ietf.org <mailto:mpls@i=
etf.org>
> >                     *=E4=B8=BB**=E9=A2=98**:*[mpls] Comments on draft
> >                     draft-cheng-mpls-inband-pm-encapsulation
> >
> >                     Hi authors,
> >
> >                      From reading your draft, have the following
> comments:
> >
> >                       * There=E2=80=99s a similar proposal in
> >                         draft-ietf-mpls-rfc6374-sfl that the WG has
> >                         worked on to achieve similar PM measurements.
> >                         That proposal did not require a special label,
> >                         nor requires carrying 2 new additional labels i=
n
> >                         label stack. Do you see any downside to the
> >                         approach in draft-ietf-mpls-rfc6374-sfl vs. the
> >                         new one introduced one? If so, can this be
> >                         highlighted....
> >
> >                     [Weiqiang]   Yes, the SFL proposal was carefully
> >                     considered before this draft was written, and the
> >                     major downsides of SFL include:
> >
> >                     1. It seems that the current version of SFL targets
> >                     at end-to-end performance measurement,  but our
> >                     draft targets at both end-to-end and hop-by-hop
> >                     performance measurement. Of course, someone may
> >                     argue that the SFL can be extended to support
> >                     hop-by-hop performance measurement, but if that
> >                     happens, the SFL method is too complex for label
> >                     management, because basically it assigns two
> >                     implications to one mpls label.
> >
> >                     2. The SFL method can't be applied when we want to
> >                     achieve performance measurements on both LSP and
> >                     PW synchronously, but the method described in our
> >                     draft can simply achieve that.
> >
> >                       * It appears that the label below the =E2=80=9CFl=
ow
> >                         Indicator Label=E2=80=9D is used to carry/embed=
 context
> >                         information: including a flow identifier and
> >                         additional flags - that are set by ingress.
> >                         Normally, MPLS labels do not embed any context
> >                         information about the flow they carry within
> >                         them. The context of the label is held by the
> >                         node that allocates the label.
> >
> >                     [Weiqiang]   Your understanding is perfectly
> >                     correct. And please also note that in our draft the
> >                     Flow-ID label values are allocated by an external
> >                     NMS or a controller, that means the context of the
> >                     Flow-ID label is held by all the nodes within the
> >                     administrative domain. Furthermore, I want to stres=
s
> >                     that the method described in our draft has already
> >                     been implemented by more than two vendors, and we
> >                     plan to deploy it in our commercial 5G backhaul
> >                     networks.
> >
> >                     Regards,
> >
> >                     Tarek
> >
> >                     _______________________________________________
> >                     mpls mailing list
> >                     mpls@ietf.org <mailto:mpls@ietf.org>
> >                     https://www.ietf.org/mailman/listinfo/mpls
> >                     <
> https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.i=
etf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D02%7C01%7Chaoyu.song%40futurewei=
.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%=
7C1%7C0%7C637096654713533899&sdata=3DeLlJd2dsRk5jZyOGbwGCGt6HushkmcjiEiGo3a=
lzvOA%3D&reserved=3D0
> >
> >
> >         _______________________________________________
> >         mpls mailing list
> >         mpls@ietf.org <mailto:mpls@ietf.org>
> >         https://www.ietf.org/mailman/listinfo/mpls
> >         <
> https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.i=
etf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D02%7C01%7Chaoyu.song%40futurewei=
.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%=
7C1%7C0%7C637096654713543892&sdata=3DHeBC5bx%2F8nbA0wOPIXZiQNQz8JVGTE%2Fn4D=
AlpE6uVhY%3D&reserved=3D0
> >
> >
> >
> >
> > _______________________________________________
> > mpls mailing list
> > mpls@ietf.org
> > https://www.ietf.org/mailman/listinfo/mpls
> >
>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000f151030597abc27a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Loa,<div>I think that the IPPM document already exists =
- it is RFC 8321. Also, there are a number of drafts, e.g., in BIER, SFC, a=
nd NVO3 WGs, that describe how the Alternate Marking method=C2=A0can be app=
lied to the particular network.</div><div><br></div><div>Regards,</div><div=
>Greg</div><div><br></div><div>Regards,</div><div>Greg</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 19,=
 2019 at 9:03 AM Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu">loa@pi.nu</=
a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Ra=
kesh,<br>
<br>
Good idea, would be enough if we captured this in the MPLS document, or<br>
should it be in the IPPM draft also?<br>
<br>
/Loa<br>
<br>
PS<br>
I added the IPPM chairs to this thread.<br>
<br>
On 19/11/2019 07:52, Rakesh Gandhi wrote:<br>
&gt; Hi Folks,<br>
&gt; Many thanks for providing the detailed comparison information for the =
<br>
&gt; two approaches. It would be good to capture them in the draft.<br>
&gt; <br>
&gt; Thanks,<br>
&gt; Rakesh<br>
&gt; <br>
&gt; <br>
&gt; On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song &lt;<a href=3D"mailto:haoyu=
.song@futurewei.com" target=3D"_blank">haoyu.song@futurewei.com</a> <br>
&gt; &lt;mailto:<a href=3D"mailto:haoyu.song@futurewei.com" target=3D"_blan=
k">haoyu.song@futurewei.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0I agree the two techniques covers different use cas=
es with different<br>
&gt;=C2=A0 =C2=A0 =C2=A0cost. Each has its own merits. Sometimes header ove=
rhead and data<br>
&gt;=C2=A0 =C2=A0 =C2=A0export bandwidth=C2=A0 are big concerns.=C2=A0 If A=
M is all user needs,<br>
&gt;=C2=A0 =C2=A0 =C2=A0there&#39;s=C2=A0 no point to use a more powerful y=
et more costly technique.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Haoyu<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0---------------------------------------------------=
---------------------<br>
&gt;=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA:* mpls &lt;<a href=3D"=
mailto:mpls-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a> &=
lt;mailto:<a href=3D"mailto:mpls-" target=3D"_blank">mpls-</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:bounces@ietf.org" target=3D"_blan=
k">bounces@ietf.org</a>&gt;&gt; =E4=BB=A3=E8=A1=A8 Giuseppe Fioccola<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:giuseppe.fioccola@huawei.com"=
 target=3D"_blank">giuseppe.fioccola@huawei.com</a> &lt;mailto:<a href=3D"m=
ailto:giuseppe.fioccola@huawei.com" target=3D"_blank">giuseppe.fioccola@hua=
wei.com</a>&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2019=E5=B9=
=B411=E6=9C=8818=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=80 =E4=B8=8B=E5=8D=885:17=
<br>
&gt;=C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA:* Greg Mirsky; Rakesh =
Gandhi<br>
&gt;=C2=A0 =C2=A0 =C2=A0*=E6=8A=84=E9=80=81:* <a href=3D"mailto:mpls@ietf.o=
rg" target=3D"_blank">mpls@ietf.org</a> &lt;mailto:<a href=3D"mailto:mpls@i=
etf.org" target=3D"_blank">mpls@ietf.org</a>&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:draft-cheng-mpls-inband-pm-encaps=
ulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulatio=
n@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-cheng-mpls-inban=
d-pm-encapsulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-e=
ncapsulation@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0*=E4=B8=BB=E9=A2=98:* Re: [mpls] Comments on draft<=
br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-cheng-mpls-inband-pm-encapsulation<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Hi All,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0I agree with Greg. And there are at least 3 big dif=
ferences between<br>
&gt;=C2=A0 =C2=A0 =C2=A0IOAM/IOAM-DEX and Alternate Marking:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A01) IOAM/IOAM-DEX is a packet level monitoring while=
 Alternate<br>
&gt;=C2=A0 =C2=A0 =C2=A0Marking is a flow monitoring solution<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A02) IOAM/IOAM-DEX introduces a new encapsulation whi=
le Alternate<br>
&gt;=C2=A0 =C2=A0 =C2=A0Marking can be encapsulated more easily and with le=
ss overhead (e.g.<br>
&gt;=C2=A0 =C2=A0 =C2=A0dedicated bits or TLV)<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A03) IOAM/IOAM-DEX architecture is more static (i.e. =
data specified by<br>
&gt;=C2=A0 =C2=A0 =C2=A0the IOAM-Trace-Type are exported by the nodes) whil=
e Alternate<br>
&gt;=C2=A0 =C2=A0 =C2=A0Marking includes a dynamic approach and can be adap=
ted to the<br>
&gt;=C2=A0 =C2=A0 =C2=A0network conditions (i.e. draft-ietf-ippm-multipoint=
-alt-mark)<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Best Regards,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Giuseppe<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0*From:*mpls [mailto:<a href=3D"mailto:mpls-bounces@=
ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:mpls-bounces@ietf.org"=
 target=3D"_blank">mpls-bounces@ietf.org</a>&gt;] *On Behalf Of *Greg Mirsk=
y<br>
&gt;=C2=A0 =C2=A0 =C2=A0*Sent:* Monday, November 18, 2019 8:07 AM<br>
&gt;=C2=A0 =C2=A0 =C2=A0*To:* Rakesh Gandhi &lt;<a href=3D"mailto:rgandhi.i=
etf@gmail.com" target=3D"_blank">rgandhi.ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com=
" target=3D"_blank">rgandhi.ietf@gmail.com</a>&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0*Cc:* <a href=3D"mailto:mpls@ietf.org" target=3D"_b=
lank">mpls@ietf.org</a> &lt;mailto:<a href=3D"mailto:mpls@ietf.org" target=
=3D"_blank">mpls@ietf.org</a>&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:draft-cheng-mpls-inband-pm-encaps=
ulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulatio=
n@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-cheng-mpls-inban=
d-pm-encapsulation@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-e=
ncapsulation@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0*Subject:* Re: [mpls] Comments on draft<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-cheng-mpls-inband-pm-encapsulation<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Hi Rakesh, et al.,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0I don&#39;t consider AltMark/SFL as just a lighter =
version of DEX. One<br>
&gt;=C2=A0 =C2=A0 =C2=A0of the benefits of Alt.Marking, in my opinion, is t=
hat a node may be<br>
&gt;=C2=A0 =C2=A0 =C2=A0aggregating measurements, and export not the raw da=
ta, as with DEX,<br>
&gt;=C2=A0 =C2=A0 =C2=A0but calculated performance metrics.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Regards,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Greg<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:rgandhi.ietf@gmail.com" targe=
t=3D"_blank">rgandhi.ietf@gmail.com</a> &lt;mailto:<a href=3D"mailto:rgandh=
i.ietf@gmail.com" target=3D"_blank">rgandhi.ietf@gmail.com</a>&gt;&gt; wrot=
e:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Tianran,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks for your reply. But this does =
not answer my question:)<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Question is why a light way is requir=
ed when there is already<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0direct export IOAM available.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regarding the SFL comment, when SFLs =
are used, we do not need<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0L/D flags in the header for coloring,=
 as an SFL itself indicates<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the color.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Rakesh<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Mon, Nov 18, 2019 at 1:57 PM Tianr=
an Zhou<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;zhoutianran@huawei..com &lt;mailt=
o:<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@h=
uawei.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Rakesh,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks for your interes=
t.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I think the requirement=
 of using alternate marking for mpls<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pm has already been ack=
nowledged by this wg. As Tarek<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mentioned several times=
, the SFL is produced for this usage.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0We bring a new encapsul=
ation here to mitigate the deployment<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0issue when we try to ap=
ply the SFL.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That=E2=80=99s our simp=
le motivation.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0BR,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=
=BA=BA**:*Rakesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ietf@gmail.com" t=
arget=3D"_blank">rgandhi.ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"m=
ailto:rgandhi.ietf@gmail.com" target=3D"_blank">rgandhi.ietf@gmail.com</a>&=
gt;]<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E9=80=81=E6=
=97=B6=E9=97=B4:* 2019=E5=B9=B411=E6=9C=8818=E6=97=A5 6:20<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=
=BA=BA:* Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=
=3D"_blank">zhoutianran@huawei.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"m=
ailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&=
gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E6=8A=84=E9=80=81:* W=
eiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang@chinamobile.com" target=
=3D"_blank">chengweiqiang@chinamobile.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"m=
ailto:chengweiqiang@chinamobile.com" target=3D"_blank">chengweiqiang@chinam=
obile.com</a>&gt;&gt;; Tarek Saad<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:t=
saad.net@gmail.com" target=3D"_blank">tsaad.net@gmail.com</a> &lt;mailto:<a=
 href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank">tsaad.net@gmail.com<=
/a>&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:draft=
-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_blank">draft-cheng=
-mpls-inband-pm-encapsulation@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"m=
ailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_blank">=
draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:mpls@=
ietf.org" target=3D"_blank">mpls@ietf.org</a> &lt;mailto:<a href=3D"mailto:=
mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E4=B8=BB=E9=A2=98:* R=
e: [mpls] Comments on draft<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-cheng-mpls-inband=
-pm-encapsulation<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Tianran,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks for your reply.<=
br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Right, IOAM Direct Expo=
rt covers more than just PM. Both<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0drafts would also requi=
re special labels for the direct<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0export for MPLS case. W=
ith this in mind, you may clarify in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the draft why lite way =
is required for PM for MPLS case and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0how it is achieved with=
 your draft compared to the IOAM<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0direct export.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Rakesh<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Sun, Nov 17, 2019 at=
 12:44 PM Tianran Zhou<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:z=
houtianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a> &lt;mai=
lto:<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran=
@huawei.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Rakesh=
,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0As the co=
author of both drafts, I think they are different.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This draf=
t is only for performance measurement in a lite<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0way.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IOAM-DEX =
is to collect data based on the trace type<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0instructi=
on.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,<b=
r>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<b=
r>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E5=8F=
=91=E4=BB=B6=E4=BA=BA**:*Rakesh Gandhi [mailto:<a href=3D"mailto:rgandhi.ie=
tf@gmail.com" target=3D"_blank">rgandhi.ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailt=
o:<a href=3D"mailto:rgandhi.ietf@gmail.com" target=3D"_blank">rgandhi.ietf@=
gmail.com</a>&gt;]<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E5=8F=
=91=E9=80=81=E6=97=B6=E9=97=B4**:*2019=E5=B9=B411=E6=9C=8813=E6=97=A55:12<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E6=94=
=B6=E4=BB=B6=E4=BA=BA**:*Weiqiang Cheng &lt;<a href=3D"mailto:chengweiqiang=
@chinamobile.com" target=3D"_blank">chengweiqiang@chinamobile.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailt=
o:<a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank">chengw=
eiqiang@chinamobile.com</a>&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E6=8A=
=84=E9=80=81**:*Tarek Saad &lt;<a href=3D"mailto:tsaad.net@gmail.com" targe=
t=3D"_blank">tsaad.net@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailt=
o:<a href=3D"mailto:tsaad.net@gmail.com" target=3D"_blank">tsaad.net@gmail.=
com</a>&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=
=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" target=3D"_bl=
ank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailt=
o:<a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org" targ=
et=3D"_blank">draft-cheng-mpls-inband-pm-encapsulation@ietf.org</a>&gt;;<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=
=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a> &lt;mailto:<a=
 href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*=E4=B8=
=BB**=E9=A2=98**:*Re: [mpls] Comments on draft<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-che=
ng-mpls-inband-pm-encapsulation<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Author=
s,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0FYI:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The draft=
 has some similarity with the functionality<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0defined i=
n the following draft which is generically<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0applicabl=
e to the all encap types:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=
=3D"https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00" =
rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draft-ioam=
team-ippm-ioam-direct-export-00</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a hr=
ef=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ft=
ools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&amp;data=
=3D02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%=
7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&amp;sdata=
=3D8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%3D&amp;reserved=3D0" rel=
=3D"noreferrer" target=3D"_blank">https://nam03.safelinks.protection.outloo=
k.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam=
-direct-export-00&amp;data=3D02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc3=
6bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C6370=
96654713533899&amp;sdata=3D8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%=
3D&amp;reserved=3D0</a>&gt;<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0You may w=
ant to have a look.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,<b=
r>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Rakesh<br=
>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Wed, S=
ep 25, 2019 at 3:00 AM Weiqiang Cheng<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a hr=
ef=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank">chengweiqiang=
@chinamobile.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailt=
o:<a href=3D"mailto:chengweiqiang@chinamobile.com" target=3D"_blank">chengw=
eiqiang@chinamobile.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Hi Tarek,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Thank you very much for your comments.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0We authors had some discussion on it and our<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0feedback is in-line.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0B.R.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Weiqiang Cheng<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA**:*mpls [mailto:<a href=3D"mailto:mpls-b=
ounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0&lt;mailto:<a href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank"=
>mpls-bounces@ietf.org</a>&gt;] *=E4=BB=A3=E8=A1=A8***Tarek Saad<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0*=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4**:*2019=E5=B9=B47=E6=9C=8822=E6=
=97=A521:34<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA**:*draft-cheng-mpls-inband-pm-<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0<a href=3D"mailto:encapsulation@ietf.org" target=3D"_blank">encapsula=
tion@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0&lt;mailto:<a href=3D"mailto:draft-cheng-mpls-inband-pm-encapsulation=
@ietf.org" target=3D"_blank">draft-cheng-mpls-inband-pm-encapsulation@ietf.=
org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0*=E6=8A=84=E9=80=81**:*<a href=3D"mailto:mpls@ietf.org" target=3D"_bl=
ank">mpls@ietf.org</a> &lt;mailto:<a href=3D"mailto:mpls@ietf.org" target=
=3D"_blank">mpls@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0*=E4=B8=BB**=E9=A2=98**:*[mpls] Comments on draft<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0draft-cheng-mpls-inband-pm-encapsulation<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Hi authors,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 From reading your draft, have the following comments:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0* There=E2=80=99s a similar proposal in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0draft-ietf-mpls-rfc6374-sfl that the WG has<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0worked on to achieve similar PM measurements.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0That proposal did not require a special label,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0nor requires carrying 2 new additional labels in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0label stack. Do you see any downside to the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0approach in draft-ietf-mpls-rfc6374-sfl vs. the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0new one introduced one? If so, can this be<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0highlighted....<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0[Weiqiang] =C2=A0 Yes, the SFL proposal was carefully<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0considered before this draft was written, and the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0major downsides of SFL include:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A01. It seems that the current version of SFL targets<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0at end-to-end performance measurement, =C2=A0but our<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0draft targets at both end-to-end and hop-by-hop<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0performance measurement. Of course, someone may<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0argue that the SFL can be extended to support<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0hop-by-hop performance measurement, but if that<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0happens, the SFL method is too complex for label<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0management, because basically=C2=A0it assigns two<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0implications to one mpls label.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A02. The SFL method can&#39;t be applied when we want to<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0achieve performance measurements on both LSP and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0PW=C2=A0synchronously, but the method described in our<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0draft can simply=C2=A0achieve that.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0* It appears that the label below the =E2=80=9CFlow<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0Indicator Label=E2=80=9D is used to carry/embed context=
<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0information: including a flow identifier and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0additional flags - that are set by ingress.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0Normally, MPLS labels do not embed any context<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0information about the flow they carry within<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0them. The context of the label is held by the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0node that allocates the label.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0[Weiqiang] =C2=A0 Your understanding is=C2=A0perfectly<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0correct. And please also note that in our draft the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Flow-ID label values are allocated by an external<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0NMS or a controller, that means the context of the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Flow-ID label is held by all the nodes within the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0administrative domain. Furthermore, I want to stress<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0that the method described in our draft has already<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0been implemented by more than two vendors, and we<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0plan to deploy it in our=C2=A0commercial 5G backhaul<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0networks.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Regards,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Tarek<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0_______________________________________________<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0mpls mailing list<br>
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=C2=A0<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a> =
&lt;mailto:<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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=C2=A0&lt;<a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3D=
https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&amp;data=3D02%7C01%7=
Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3=
b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&amp;sdata=3DeLlJd2dsRk5=
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&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0_____________________________________=
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&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mpls mailing list<br>
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an/listinfo/mpls" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org=
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dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C6370966547=
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reserved=3D0</a>&gt;<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; mpls mailing list<br>
&gt; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><b=
r>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferr=
er" target=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
&gt; <br>
<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

--000000000000f151030597abc27a--


From nobody Mon Nov 18 21:56:22 2019
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To: Greg Mirsky <gregimirsky@gmail.com>
Cc: Rakesh Gandhi <rgandhi.ietf@gmail.com>, Haoyu Song <haoyu.song@futurewei.com>, "mpls@ietf.org" <mpls@ietf.org>, "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
References: <BBA82579FD347748BEADC4C445EA0F21BF0D1BD8@NKGEML515-MBX.china.huawei.com> <CAMZsk6d94O0_9KO93dTcSRSiid-Py3U2EwZ+GmLt4LzRi5UakA@mail.gmail.com> <CA+RyBmXpKbWq-qVu1R92zkg2BLj3Cfr5peUqXam2sxYjEVEC6w@mail.gmail.com> <fe5ae561c8024c4682c5ca7cec887806@huawei.com> <MWHPR13MB1648AA2A53854A001E2F90129A4D0@MWHPR13MB1648.namprd13.prod.outlook.com> <CAMZsk6cccUx2dXFxdH7QkkONvS7=k2nknLOFZdVLiEOoOyK_Wg@mail.gmail.com> <09e5a1cf-ed35-b014-8051-8a55cc2f91c0@pi.nu> <CA+RyBmX+OLM1hzs6=-LibPVijyM8A6yrexrLs_JU==bL3dLpYg@mail.gmail.com>
From: Loa Andersson <loa@pi.nu>
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Date: Tue, 19 Nov 2019 13:56:02 +0800
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Greg,

tnx! Then we have the question on there to document the differences
between the two solutions, do we have any ideas?

/Loa

On 19/11/2019 12:47, Greg Mirsky wrote:
> Hi Loa,
> I think that the IPPM document already exists - it is RFC 8321. Also, 
> there are a number of drafts, e.g., in BIER, SFC, and NVO3 WGs, that 
> describe how the Alternate Marking method can be applied to the 
> particular network.
> 
> Regards,
> Greg
> 
> Regards,
> Greg
> 
> On Tue, Nov 19, 2019 at 9:03 AM Loa Andersson <loa@pi.nu 
> <mailto:loa@pi.nu>> wrote:
> 
>     Rakesh,
> 
>     Good idea, would be enough if we captured this in the MPLS document, or
>     should it be in the IPPM draft also?
> 
>     /Loa
> 
>     PS
>     I added the IPPM chairs to this thread.
> 
>     On 19/11/2019 07:52, Rakesh Gandhi wrote:
>      > Hi Folks,
>      > Many thanks for providing the detailed comparison information for
>     the
>      > two approaches. It would be good to capture them in the draft.
>      >
>      > Thanks,
>      > Rakesh
>      >
>      >
>      > On Mon, Nov 18, 2019 at 5:55 PM Haoyu Song
>     <haoyu.song@futurewei.com <mailto:haoyu.song@futurewei.com>
>      > <mailto:haoyu.song@futurewei.com
>     <mailto:haoyu.song@futurewei.com>>> wrote:
>      >
>      >     I agree the two techniques covers different use cases with
>     different
>      >     cost. Each has its own merits. Sometimes header overhead and data
>      >     export bandwidth  are big concerns.  If AM is all user needs,
>      >     there's  no point to use a more powerful yet more costly
>     technique.
>      >
>      >     Haoyu
>      >
>      >
>      >
>      >   
>       ------------------------------------------------------------------------
>      >     *发件人:* mpls <mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org> <mailto:mpls- <mailto:mpls->
>      > bounces@ietf.org <mailto:bounces@ietf.org>>> 代表 Giuseppe Fioccola
>      >     <giuseppe.fioccola@huawei.com
>     <mailto:giuseppe.fioccola@huawei.com>
>     <mailto:giuseppe.fioccola@huawei.com
>     <mailto:giuseppe.fioccola@huawei.com>>>
>      >     *发送时间:* 2019年11月18日星期一 下午5:17
>      >     *收件人:* Greg Mirsky; Rakesh Gandhi
>      >     *抄送:* mpls@ietf.org <mailto:mpls@ietf.org>
>     <mailto:mpls@ietf.org <mailto:mpls@ietf.org>>;
>      > draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>      >     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>>
>      >     *主题:* Re: [mpls] Comments on draft
>      >     draft-cheng-mpls-inband-pm-encapsulation
>      >
>      >     Hi All,
>      >
>      >     I agree with Greg. And there are at least 3 big differences
>     between
>      >     IOAM/IOAM-DEX and Alternate Marking:
>      >
>      >     1) IOAM/IOAM-DEX is a packet level monitoring while Alternate
>      >     Marking is a flow monitoring solution
>      >
>      >     2) IOAM/IOAM-DEX introduces a new encapsulation while Alternate
>      >     Marking can be encapsulated more easily and with less
>     overhead (e.g.
>      >     dedicated bits or TLV)
>      >
>      >     3) IOAM/IOAM-DEX architecture is more static (i.e. data
>     specified by
>      >     the IOAM-Trace-Type are exported by the nodes) while Alternate
>      >     Marking includes a dynamic approach and can be adapted to the
>      >     network conditions (i.e. draft-ietf-ippm-multipoint-alt-mark)
>      >
>      >     Best Regards,
>      >
>      >     Giuseppe
>      >
>      >     *From:*mpls [mailto:mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org>
>      >     <mailto:mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org>>] *On Behalf Of *Greg Mirsky
>      >     *Sent:* Monday, November 18, 2019 8:07 AM
>      >     *To:* Rakesh Gandhi <rgandhi.ietf@gmail.com
>     <mailto:rgandhi.ietf@gmail.com>
>      >     <mailto:rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>>>
>      >     *Cc:* mpls@ietf.org <mailto:mpls@ietf.org>
>     <mailto:mpls@ietf.org <mailto:mpls@ietf.org>>;
>      > draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>      >     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>>
>      >     *Subject:* Re: [mpls] Comments on draft
>      >     draft-cheng-mpls-inband-pm-encapsulation
>      >
>      >     Hi Rakesh, et al.,
>      >
>      >     I don't consider AltMark/SFL as just a lighter version of
>     DEX. One
>      >     of the benefits of Alt.Marking, in my opinion, is that a node
>     may be
>      >     aggregating measurements, and export not the raw data, as
>     with DEX,
>      >     but calculated performance metrics.
>      >
>      >     Regards,
>      >
>      >     Greg
>      >
>      >     On Mon, Nov 18, 2019 at 2:57 PM Rakesh Gandhi
>      >     <rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>
>     <mailto:rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>>> wrote:
>      >
>      >         Hi Tianran,
>      >
>      >         Thanks for your reply. But this does not answer my question:)
>      >
>      >         Question is why a light way is required when there is already
>      >         direct export IOAM available.
>      >
>      >         Regarding the SFL comment, when SFLs are used, we do not need
>      >         L/D flags in the header for coloring, as an SFL itself
>     indicates
>      >         the color.
>      >
>      >         Thanks,
>      >
>      >         Rakesh
>      >
>      >         On Mon, Nov 18, 2019 at 1:57 PM Tianran Zhou
>      >         <zhoutianran@huawei..com <mailto:zhoutianran@huawei.com
>     <mailto:zhoutianran@huawei.com>>> wrote:
>      >
>      >             Hi Rakesh,
>      >
>      >             Thanks for your interest.
>      >
>      >             I think the requirement of using alternate marking
>     for mpls
>      >             pm has already been acknowledged by this wg. As Tarek
>      >             mentioned several times, the SFL is produced for this
>     usage.
>      >
>      >             We bring a new encapsulation here to mitigate the
>     deployment
>      >             issue when we try to apply the SFL.
>      >
>      >             That’s our simple motivation.
>      >
>      >             BR,
>      >
>      >             Tianran
>      >
>      >             *发件人**:*Rakesh Gandhi
>     [mailto:rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>
>      >             <mailto:rgandhi.ietf@gmail.com
>     <mailto:rgandhi.ietf@gmail.com>>]
>      >             *发送时间:* 2019年11月18日 6:20
>      >             *收件人:* Tianran Zhou <zhoutianran@huawei.com
>     <mailto:zhoutianran@huawei.com>
>      >             <mailto:zhoutianran@huawei.com
>     <mailto:zhoutianran@huawei.com>>>
>      >             *抄送:* Weiqiang Cheng <chengweiqiang@chinamobile.com
>     <mailto:chengweiqiang@chinamobile.com>
>      >             <mailto:chengweiqiang@chinamobile.com
>     <mailto:chengweiqiang@chinamobile.com>>>; Tarek Saad
>      >             <tsaad.net@gmail.com <mailto:tsaad.net@gmail.com>
>     <mailto:tsaad.net@gmail.com <mailto:tsaad.net@gmail.com>>>;
>      > draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>      >           
>       <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>>;
>      > mpls@ietf.org <mailto:mpls@ietf.org> <mailto:mpls@ietf.org
>     <mailto:mpls@ietf.org>>
>      >             *主题:* Re: [mpls] Comments on draft
>      >             draft-cheng-mpls-inband-pm-encapsulation
>      >
>      >             Hi Tianran,
>      >
>      >             Thanks for your reply.
>      >
>      >             Right, IOAM Direct Export covers more than just PM. Both
>      >             drafts would also require special labels for the direct
>      >             export for MPLS case. With this in mind, you may
>     clarify in
>      >             the draft why lite way is required for PM for MPLS
>     case and
>      >             how it is achieved with your draft compared to the IOAM
>      >             direct export.
>      >
>      >             Thanks,
>      >
>      >             Rakesh
>      >
>      >             On Sun, Nov 17, 2019 at 12:44 PM Tianran Zhou
>      >             <zhoutianran@huawei.com
>     <mailto:zhoutianran@huawei.com> <mailto:zhoutianran@huawei.com
>     <mailto:zhoutianran@huawei.com>>> wrote:
>      >
>      >                 Hi Rakesh,
>      >
>      >                 As the coauthor of both drafts, I think they are
>     different.
>      >
>      >                 This draft is only for performance measurement in
>     a lite
>      >                 way.
>      >
>      >                 IOAM-DEX is to collect data based on the trace type
>      >                 instruction.
>      >
>      >                 Thanks,
>      >
>      >                 Tianran
>      >
>      >                 *发件人**:*Rakesh Gandhi
>     [mailto:rgandhi.ietf@gmail.com <mailto:rgandhi.ietf@gmail.com>
>      >                 <mailto:rgandhi.ietf@gmail.com
>     <mailto:rgandhi.ietf@gmail.com>>]
>      >                 *发送时间**:*2019年11月13日5:12
>      >                 *收件人**:*Weiqiang Cheng
>     <chengweiqiang@chinamobile.com <mailto:chengweiqiang@chinamobile.com>
>      >                 <mailto:chengweiqiang@chinamobile.com
>     <mailto:chengweiqiang@chinamobile.com>>>
>      >                 *抄送**:*Tarek Saad <tsaad.net@gmail.com
>     <mailto:tsaad.net@gmail.com>
>      >                 <mailto:tsaad.net@gmail.com
>     <mailto:tsaad.net@gmail.com>>>;
>      > draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
>      >               
>       <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>>;
>      > mpls@ietf.org <mailto:mpls@ietf.org> <mailto:mpls@ietf.org
>     <mailto:mpls@ietf.org>>
>      >                 *主**题**:*Re: [mpls] Comments on draft
>      >                 draft-cheng-mpls-inband-pm-encapsulation
>      >
>      >                 Hi Authors,
>      >
>      >                 FYI:
>      >
>      >                 The draft has some similarity with the functionality
>      >                 defined in the following draft which is generically
>      >                 applicable to the all encap types:
>      >
>      > https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00
>      >               
>       <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=8%2FMYlbsByQtiewLK0%2BgHzGu9rAJybEVbozdAG6mH5Jo%3D&reserved=0>
>      >
>      >                 You may want to have a look.
>      >
>      >                 Thanks,
>      >
>      >                 Rakesh
>      >
>      >                 On Wed, Sep 25, 2019 at 3:00 AM Weiqiang Cheng
>      >                 <chengweiqiang@chinamobile.com
>     <mailto:chengweiqiang@chinamobile.com>
>      >                 <mailto:chengweiqiang@chinamobile.com
>     <mailto:chengweiqiang@chinamobile.com>>> wrote:
>      >
>      >                     Hi Tarek,
>      >
>      >                     Thank you very much for your comments.
>      >
>      >                     We authors had some discussion on it and our
>      >                     feedback is in-line.
>      >
>      >                     B.R.
>      >
>      >                     Weiqiang Cheng
>      >
>      >                     *发件人**:*mpls [mailto:mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org>
>      >                     <mailto:mpls-bounces@ietf.org
>     <mailto:mpls-bounces@ietf.org>>] *代表***Tarek Saad
>      >                     *发送时间**:*2019年7月22日21:34
>      >                     *收件人**:*draft-cheng-mpls-inband-pm-
>      > encapsulation@ietf.org <mailto:encapsulation@ietf.org>
>      >                   
>       <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org
>     <mailto:draft-cheng-mpls-inband-pm-encapsulation@ietf.org>>
>      >                     *抄送**:*mpls@ietf.org <mailto:mpls@ietf.org>
>     <mailto:mpls@ietf.org <mailto:mpls@ietf.org>>
>      >                     *主**题**:*[mpls] Comments on draft
>      >                     draft-cheng-mpls-inband-pm-encapsulation
>      >
>      >                     Hi authors,
>      >
>      >                      From reading your draft, have the following
>     comments:
>      >
>      >                       * There’s a similar proposal in
>      >                         draft-ietf-mpls-rfc6374-sfl that the WG has
>      >                         worked on to achieve similar PM measurements.
>      >                         That proposal did not require a special
>     label,
>      >                         nor requires carrying 2 new additional
>     labels in
>      >                         label stack. Do you see any downside to the
>      >                         approach in draft-ietf-mpls-rfc6374-sfl
>     vs. the
>      >                         new one introduced one? If so, can this be
>      >                         highlighted....
>      >
>      >                     [Weiqiang]   Yes, the SFL proposal was carefully
>      >                     considered before this draft was written, and the
>      >                     major downsides of SFL include:
>      >
>      >                     1. It seems that the current version of SFL
>     targets
>      >                     at end-to-end performance measurement,  but our
>      >                     draft targets at both end-to-end and hop-by-hop
>      >                     performance measurement. Of course, someone may
>      >                     argue that the SFL can be extended to support
>      >                     hop-by-hop performance measurement, but if that
>      >                     happens, the SFL method is too complex for label
>      >                     management, because basically it assigns two
>      >                     implications to one mpls label.
>      >
>      >                     2. The SFL method can't be applied when we
>     want to
>      >                     achieve performance measurements on both LSP and
>      >                     PW synchronously, but the method described in our
>      >                     draft can simply achieve that.
>      >
>      >                       * It appears that the label below the “Flow
>      >                         Indicator Label” is used to carry/embed
>     context
>      >                         information: including a flow identifier and
>      >                         additional flags - that are set by ingress.
>      >                         Normally, MPLS labels do not embed any
>     context
>      >                         information about the flow they carry within
>      >                         them. The context of the label is held by the
>      >                         node that allocates the label.
>      >
>      >                     [Weiqiang]   Your understanding is perfectly
>      >                     correct. And please also note that in our
>     draft the
>      >                     Flow-ID label values are allocated by an external
>      >                     NMS or a controller, that means the context
>     of the
>      >                     Flow-ID label is held by all the nodes within the
>      >                     administrative domain. Furthermore, I want to
>     stress
>      >                     that the method described in our draft has
>     already
>      >                     been implemented by more than two vendors, and we
>      >                     plan to deploy it in our commercial 5G backhaul
>      >                     networks.
>      >
>      >                     Regards,
>      >
>      >                     Tarek
>      >
>      >                     _______________________________________________
>      >                     mpls mailing list
>      > mpls@ietf.org <mailto:mpls@ietf.org> <mailto:mpls@ietf.org
>     <mailto:mpls@ietf.org>>
>      > https://www.ietf.org/mailman/listinfo/mpls
>      >                   
>       <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713533899&sdata=eLlJd2dsRk5jZyOGbwGCGt6HushkmcjiEiGo3alzvOA%3D&reserved=0>
>      >
>      >         _______________________________________________
>      >         mpls mailing list
>      > mpls@ietf.org <mailto:mpls@ietf.org> <mailto:mpls@ietf.org
>     <mailto:mpls@ietf.org>>
>      > https://www.ietf.org/mailman/listinfo/mpls
>      >       
>       <https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cb28cbc36bf1c4dc2b1ad08d76c082e64%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637096654713543892&sdata=HeBC5bx%2F8nbA0wOPIXZiQNQz8JVGTE%2Fn4DAlpE6uVhY%3D&reserved=0>
>      >
>      >
>      >
>      > _______________________________________________
>      > mpls mailing list
>      > mpls@ietf.org <mailto:mpls@ietf.org>
>      > https://www.ietf.org/mailman/listinfo/mpls
>      >
> 
>     -- 
> 
> 
>     Loa Andersson                        email: loa@pi.nu <mailto:loa@pi.nu>
>     Senior MPLS Expert
>     Bronze Dragon Consulting             phone: +46 739 81 21 64
> 
>     _______________________________________________
>     mpls mailing list
>     mpls@ietf.org <mailto:mpls@ietf.org>
>     https://www.ietf.org/mailman/listinfo/mpls
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: Tianran Zhou <zhoutianran@huawei.com>
To: Loa Andersson <loa@pi.nu>, Greg Mirsky <gregimirsky@gmail.com>
CC: Rakesh Gandhi <rgandhi.ietf@gmail.com>, Haoyu Song <haoyu.song@futurewei.com>, mpls <mpls@ietf.org>, ippm-chairs <ippm-chairs@ietf.org>, draft-cheng-mpls-inband-pm-encapsulation <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
Thread-Topic: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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Date: Tue, 19 Nov 2019 08:03:13 +0000
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Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
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From nobody Thu Nov 21 18:29:47 2019
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Subject: [mpls] I-D Action: draft-ietf-mpls-spl-terminology-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : Special Purpose Label terminology
        Authors         : Loa Andersson
                          Kireeti Kompella
                          Adrian Farrel
	Filename        : draft-ietf-mpls-spl-terminology-01.txt
	Pages           : 6
	Date            : 2019-11-21

Abstract:
   This document discusses and recommends a terminology that may be used
   when MPLS Special Purpose Labels (SPL) are specified and documented.

   This document updates RFC 7274 and RFC 3032.


The IETF datatracker status page for this draft is:
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From nobody Tue Nov 26 16:37:51 2019
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Subject: [mpls] I-D Action: draft-mirsky-mpls-p2mp-bfd-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : BFD for Multipoint Networks over Point-to-Multi-Point MPLS LSP
        Author          : Greg Mirsky
	Filename        : draft-mirsky-mpls-p2mp-bfd-08.txt
	Pages           : 8
	Date            : 2019-11-26

Abstract:
   This document describes procedures for using Bidirectional Forwarding
   Detection (BFD) for multipoint networks to detect data plane failures
   in Multiprotocol Label Switching (MPLS) point-to-multipoint (p2mp)
   Label Switched Paths (LSPs).  It also describes the applicability of
   LSP Ping, as in-band, and the control plane, as out-band, solutions
   to bootstrap a BFD session in this environment.


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From nobody Fri Nov 29 22:54:39 2019
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From: Mach Chen <mach.chen@huawei.com>
To: Tarek Saad <tsaad.net@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>, "draft-ietf-mpls-sfl-framework@ietf.org" <draft-ietf-mpls-sfl-framework@ietf.org>
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Thread-Topic: IPR Poll: draft-ietf-mpls-sfl-framework
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Date: Sat, 30 Nov 2019 06:54:24 +0000
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Subject: Re: [mpls] IPR Poll: draft-ietf-mpls-sfl-framework
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Hi,

I am not aware of any IPR applies to this document.

Best regards,
Mach

From: Tarek Saad [mailto:tsaad.net@gmail.com]
Sent: Wednesday, October 23, 2019 11:53 AM
To: mpls@ietf.org; draft-ietf-mpls-sfl-framework@ietf.org
Cc: MPLS Working Group <mpls-chairs@ietf.org>
Subject: IPR Poll: draft-ietf-mpls-sfl-framework

Hi Authors and MPLS WG,

We are currently preparing draft-ietf-mpls-sfl-framework for working group =
last call. Part of this preparation is to do an IPR poll.
This email is to start the IPR poll.

If you are aware of IPR that applies to draft-ietf-mpls-sfl-framework pleas=
e respond to this email, and indicate whether it has been disclosed in acco=
rdance to the IETF IPR rules (detailed are described in RFCs 3979, 4879, 36=
69 and 5378).

If you are an author or contributor please respond to this email regardless=
 of whether or not you're aware of any IPR. If you are not an author or con=
tributor, please explicitly respond only if you're aware of IPR that has no=
t yet been disclosed.

This document will advance to WGLC only when all IPR confirmations from all=
 authors and contributors have been received.

Regards,
Tarek/Loa/Nic


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Hi,<o:p></o:p></span></font>=
</p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">I am not aware of any IPR ap=
plies to this document.<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Best regards,<o:p></o:p></sp=
an></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Mach<o:p></o:p></span></font=
></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b><font size=3D"2">=
<span style=3D"font-size:11.0pt"> Tarek Saad [mailto:tsaad.net@gmail.com]
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> Wednesday, October 23,=
 2019 11:53 AM<br>
<b><span style=3D"font-weight:bold">To:</span></b> mpls@ietf.org; draft-iet=
f-mpls-sfl-framework@ietf.org<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> MPLS Working Group &lt;m=
pls-chairs@ietf.org&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> IPR Poll: draft-iet=
f-mpls-sfl-framework<o:p></o:p></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">Hi Authors and MPLS WG,<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">We are currently preparing draft-ietf-mpls-sfl-framework for=
 working group last call. Part of this preparation is to do an IPR poll.<o:=
p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">This email is to start the IPR poll.<o:p></o:p></span></font=
></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">If you are aware of&nbsp;IPR&nbsp;that applies to&nbsp;draft=
-ietf-mpls-sfl-framework please respond to this email, and indicate whether=
 it has been disclosed in accordance to the IETF&nbsp;IPR&nbsp;rules
 (detailed are described in RFCs 3979, 4879, 3669 and 5378).<o:p></o:p></sp=
an></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">If you are an&nbsp;author or contributor&nbsp;please respond=
 to this email regardless of whether or not you're aware of any&nbsp;IPR. I=
f you are not an author or contributor, please explicitly
 respond only if you're aware of&nbsp;IPR&nbsp;that has not yet been disclo=
sed.<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">This document will advance to WGLC only when all IPR&nbsp;co=
nfirmations from all authors and contributors have been received.<o:p></o:p=
></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">Regards,<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt">Tarek/Loa/Nic<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Calibri"><span style=3D"fon=
t-size:12.0pt"><o:p>&nbsp;</o:p></span></font></p>
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